BOSTON PARTNERS ASSET MANAGEMENT L P
SC 13G/A, 1999-02-12
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           (AMENDMENT NO.    1   )*
                                         --------

                        Highlands Insurance Group, Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   431032101
                               -----------------
                                 (CUSIP Number)

            December 31, 1998  - Amendment pursuant to Rule 13d-2(b)
- -------------------------------------------------------------------------------
           (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [X] Rule 13d-1(b)

         [ ] Rule 13d-1(c)

         [ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>   2





- ------------------------                    -------------------------------

CUSIP NO. 431032101             13G         Page    1     of    3    Pages
                                                 --------    -------
- ------------------------                    -------------------------------
- ---------------------------------------------------------------------------
                                                                           
- ---------------------------------------------------------------------------
 1     NAME OF REPORTING PERSON                                            
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                   
                                                                           
       Boston Partners Asset Management, L.P.                              
                                                                           
- ---------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) [ ] 
                                                                   (b) [ ] 
       Not applicable                                                      
                                                                           
- ---------------------------------------------------------------------------
 3     SEC USE ONLY                                                        
                                                                           
                                                                           
                                                                           
- ---------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION                                
                                                                           
       Delaware                                                            
                                                                           
- ---------------------------------------------------------------------------
                          5     SOLE VOTING POWER                          
                                                                           
                                -0- shares                                 
                         --------------------------------------------------
     NUMBER OF            6     SHARED VOTING POWER                        
       SHARES                                                              
    BENEFICIALLY                631,500 shares                             
      OWNED BY                                                             
        EACH             --------------------------------------------------
     REPORTING            7     SOLE DISPOSITIVE POWERREPORTING            
       PERSON                                                              
        WITH                    -0- shares                                 
                         --------------------------------------------------
                          8     SHARED DISPOSITIVE POWER                   
                                                                           
                                631,500 shares                             
- ---------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON        
                                                                           
       631,500 shares                                                      
- ---------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN    [ ]
       SHARES*

       Not applicable
- ---------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                   
                                                                           
       4.9%                                                                
                                                                           
- ---------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *                                          
                                                                           
       IA                                                                  
- ---------------------------------------------------------------------------
                                                                           
                                                                           
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!                 
                                                                           




<PAGE>   3





- ------------------------                     ---------------------------------

CUSIP NO. 431032101              13G         Page     2     of    3     Pages
                                                  ---------    --------
- ------------------------                     ---------------------------------
- ------------------------------------------------------------------------------
 1     NAME OF REPORTING PERSON                                               
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                      
                                                                              
       Boston Partners, Inc.                                                  
                                                                              
- ------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*               (a) [ ] 
                                                                       (b) [ ] 
       Not applicable                                                         
                                                                              
- ------------------------------------------------------------------------------
 3     SEC USE ONLY                                                           
                                                                              
                                                                              
                                                                              
- ------------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION                                   
                                                                              
       Delaware                                                               
                                                                              
- ------------------------------------------------------------------------------
                          5     SOLE VOTING POWER                             
                                                                              
                                -0- shares                                    
                         -----------------------------------------------------
     NUMBER OF                                                                
       SHARES             6     SHARED VOTING POWER                           
    BENEFICIALLY                                                              
      OWNED BY                  631,500 shares                                
        EACH             -----------------------------------------------------
     REPORTING            7     SOLE DISPOSITIVE POWER                        
       PERSON                                                                 
        WITH                    -0- shares                                    
                                                                              
                         -----------------------------------------------------
                          8     SHARED DISPOSITIVE POWER                      
                                                                              
                                631,500 shares                                
- ------------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON           
                                                                              
       631,500 shares                                                         
- ------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN       [ ] 
       SHARES*                                                                
                                                                              
       Not applicable                                                         
- ------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                      
                                                                              
       4.9%                                                                   
                                                                              
- ------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *                                             
                                                                              
       CO                                                                     
- ------------------------------------------------------------------------------


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                       
<PAGE>   4





- ------------------------                     ---------------------------------

CUSIP NO. 431032101              13G         Page    3     of    3     Pages
                                                  --------    --------
- ------------------------                     ---------------------------------
- ------------------------------------------------------------------------------
 1     NAME OF REPORTING PERSON                                               
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                      
                                                                              
       Desmond John Heathwood                                                 
                                                                              
- ------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ] 
                                                                      (b) [ ] 
       Not applicable                                                         
                                                                              
- ------------------------------------------------------------------------------
 3     SEC USE ONLY                                                           
                                                                              
                                                                              
                                                                              
- ------------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION                                   
                                                                              
       United States                                                          
                                                                              
- ------------------------------------------------------------------------------
                          5     SOLE VOTING POWER                             
                                                                              
                                -0- shares                                    
                         -----------------------------------------------------
     NUMBER OF            6     SHARED VOTING POWER                           
       SHARES                                                                 
    BENEFICIALLY                631,500 shares                                
      OWNED BY           -----------------------------------------------------
        EACH              7     SOLE DISPOSITIVE POWER                        
     REPORTING                                                                
       PERSON                   -0- shares                                    
        WITH                                                                  
                         -----------------------------------------------------
                          8     SHARED DISPOSITIVE POWER                      
                                                                              
                                631,500 shares                                
- ------------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON           
                                                                              
       631,500 shares                                                         
- ------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN      [ ] 
       SHARES*                                                                
                                                                              
       Not applicable                                                         
- ------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                      
                                                                              
       4.9%                                                                   
                                                                              
- ------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *                                             
                                                                              
       IN                                                                     
- ------------------------------------------------------------------------------


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>   5



Item 1(a).       Name of Issuer:  Highlands Insurance Group, Inc. (the
                 "Issuer").

Item 1(b).       Address of Issuer's Principal Executive Offices:
                 1000 Lenox Drive, Lawrenceville, New Jersey  08648

Item 2(a).       Names of Persons Filing:  Boston Partners Asset Management,
                 L.P. ("BPAM"), Boston Partners, Inc. ("Boston Partners"), and
                 Desmond John Heathwood.  BPAM, Boston Partners, and Mr.
                 Heathwood are sometimes referred to collectively herein as the
                 "Reporting Persons."

Item 2(b).       Address of Principal Business Office or, if None, Residence:
                 The address of the principal business office of BPAM, Boston
                 Partners, and Mr. Heathwood is 28 State Street, 20th Floor,
                 Boston, MA 02109.

Item 2(c).       Citizenship:  BPAM is a Delaware limited partnership.  Boston
                 Partners is a Delaware corporation.  Mr. Heathwood is a United
                 States citizen.

Item 2(d).       Title of Class of Securities:  Common Stock, $.01 par value
                 ("Common Stock").

Item 2(e).       CUSIP Number:  431032101

Item 3.          If this statement is filed pursuant to Rule 13d-1(b) or
                 13d-2(b) or (c), check whether the person filing is a:

                          (a)     [    ]   Broker or dealer registered under
                                           section 15 of the Act (15 U.S.C.
                                           78o).

                          (b)     [    ]   Bank as defined in section 3(a)(6)
                                           of the Act (15 U.S.C. 78c).

                          (c)     [    ]   Insurance Company as defined in
                                           section 3(a)(19) of the Act (15
                                           U.S.C. 78c).

                          (d)     [    ]   Investment Company registered under
                                           section 8 of the Investment Company
                                           Act of 1940 (15 U.S.C. 80a-8).

                          (e)     [  X ]   An investment adviser in accordance
                                           with Rule 13d-1(b)(1)(ii)(E);

                          (f)     [    ]   An employee benefit plan or
                                           endowment fund in accordance with
                                           Rule 13d-1(b)(1)(ii)(F);

                          (g)     [    ]   A parent holding company or control
                                           person in accordance with Rule
                                           13d-1(b)(1)(ii)(G);




<PAGE>   6



                          (h)     [    ]   A savings association as defined in
                                           section 3(b) of the Federal Deposit
                                           Insurance Act (12 U.S.C. 1813);

                          (i)     [    ]   A church plan that is excluded from
                                           the definition of an investment
                                           company under section 3(c)(14) of
                                           the Investment Company Act of 1940
                                           (15 U.S.C. 80a-3);

                          (j)     [    ]   Group, in accordance with Rule
                                           13d-1(b)(1)(ii)(J).

Item 4.          Ownership.

        (a)      Amount Beneficially Owned:  Each of the Reporting Persons may
                 be deemed to own beneficially 631,500 shares of Common Stock
                 at December 31, 1998.  BPAM owns of record 631,500 shares of
                 Common Stock. As sole general partner of BPAM, Boston Partners
                 may be deemed to own beneficially all of the shares of Common
                 Stock that BPAM may be deemed to own beneficially.  As
                 principal stockholder of Boston Partners, Mr. Heathwood may be
                 deemed to own beneficially all of the Common Stock that Boston
                 Partners may be deemed to own beneficially. Therefore, each of
                 the Reporting Persons may be deemed to own beneficially
                 631,500 shares of Common Stock of the Issuer.

        (b)      Percent of Class:  4.9% for all Reporting Persons. The
                 foregoing percentage is calculated based on the 12,944,926
                 shares of Common Stock reported to be outstanding on September
                 30, 1998 as reported on the Form 10-Q for the quarter ended
                 September 30, 1998.

        (c)      Number of shares as to which such person has:

                 (i)     sole power to vote or to direct the vote:  0 shares
                         for all Reporting Persons.

                 (ii)    shared power to vote or to direct the vote: 631,500
                         shares for all Reporting Persons.

                 (iii)   sole power to dispose or to direct the disposition of:
                         0 shares for all Reporting Persons.

                 (iv)    shared power to dispose or to direct the disposition
                         of:  631,500 shares for all Reporting Persons.

                 Pursuant to Rule 13d-4, each of Boston Partners and Mr.
                 Heathwood expressly disclaims beneficial ownership of any
                 shares of Common Stock of the Issuer.

Item 5.          Ownership of Five Percent or Less of a Class.




<PAGE>   7




                 If this statement is being filed to report that as of the date
                 hereof the Reporting Persons have ceased to be the beneficial
                 owners of more than five percent of the Common Stock of the
                 Issuer, check the following [  X  ].

Item 6.          Ownership of More than Five Percent on Behalf of Another
                 Person.

                 BPAM holds all of the above 631,500 shares under management
                 for its clients, who have the right to direct the receipt of
                 dividends, to receive dividends from such shares and to
                 receive the proceeds from the sale of such shares.  None of
                 these clients holds more than five percent of the Common Stock
                 of the Issuer.

Item 7.          Identification and Classification of the Subsidiary Which
                 Acquired the Security Being Reported on by the Parent Holding
                 Company.

                 Not applicable.

Item 8.          Identification and Classification of Members of the Group.

                 Not applicable.  BPAM, Boston Partners and Mr. Heathwood
                 expressly disclaim membership in a "group" as defined in Rule
                 13d-5(b)(1).

Item 9.          Notice of Dissolution of Group.

                 Not applicable.

Item 10.         Certification.

                 By signing below we certify that, to the best of our knowledge
                 and belief, the securities referred to above were acquired and
                 are held in the ordinary course of business and were not
                 acquired and are not held for the purpose of or with the
                 effect of changing or influencing the control of the issuer of
                 the securities and were not acquired and are not held in
                 connection with or as participant in any transaction having
                 that purpose or effect.





<PAGE>   8




                                   SIGNATURE

         After reasonable inquiry and to the best of our knowledge and belief,
we certify that the information set forth in this statement is true, complete
and correct.  We also hereby agree to file this statement jointly pursuant to
the agreement set forth as Exhibit 1 hereto.

Dated:  February 12, 1999


BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.,
         its general partner


         By:     /s/ William J. Kelly
                 --------------------
                 William J. Kelly
                 Treasurer and Senior Vice President




BOSTON PARTNERS, INC.


         By:     /s/ William J. Kelly
                 --------------------
                 William J. Kelly
                 Treasurer and Senior Vice President




/s/ William J. Kelly
- --------------------
Desmond John Heathwood
by:      William J. Kelly
         Attorney-in-Fact*

*        Signed pursuant to a Power of Attorney executed by Desmond John 
Heathwood, a copy of which is filed herewith.
<PAGE>   9



                                                                       Exhibit 1

                                   AGREEMENT


         Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of
1934, the undersigned hereby agree that only one statement containing the
information required by Schedule 13G need be filed with respect to the
ownership by each of the undersigned of shares of Common Stock of Highlands
Insurance Group, Inc.

         This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

         EXECUTED this 12th day of February, 1999.


BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.
         its general partner


         By:     /s/ William J. Kelly
                 --------------------
                 William J. Kelly
                 Treasurer and Senior Vice President



BOSTON PARTNERS, INC.


         By:     /s/ William J. Kelly
                 --------------------
                 William J. Kelly
                 Treasurer and Senior Vice President




/s/ William J. Kelly
- --------------------
Desmond John Heathwood
by:      William J. Kelly
         Attorney-in-Fact*

*        Signed pursuant to a Power of Attorney executed by Desmond John 
Heathwood, a copy of which is filed herewith.

<PAGE>   1
                                                                    EXHIBIT 24.1

                               POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned, Desmond John
Heathwood, hereby constitutes and appoints William J. Kelly and Mary Ann
Iudice his true and lawful attorneys-in-fact and agents, for him and in his
name, place and stead, to sign any Schedule 13G or Schedule 13D relating to
beneficial ownership and changes in beneficial ownership of equity securities
of the companies set forth on Exhibit A hereto (each, a "Company" and,
collectively, the "Companies"), and any amendment thereto, and to file the
same, with all exhibits thereto and other documents in connection therewith,
with the U.S. Securities and Exchange Commission, and submit copies thereof to
any securities exchange or automated quotation system and to the applicable
Company, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite or necessary
to be done, as fully to all intents and purposes as the undersigned might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents may lawfully do or cause to be done by virtue
hereof.  This power-of-attorney shall expire at such time as the undersigned
ceases to be subject to filing requirements under Section 13(d) and/or 13(g)
under the Securities and Exchange Act of 1934, as amended, with respect to the
Companies.


                                   /s/ Desmond J. Heathwood
                                   ------------------------
                                   Desmond John Heathwood

                                   Dated: February 9, 1998





<PAGE>   2



                                                                       EXHIBIT A

                     Companies Subject to Power of Attorney
                          Dated as of February 9, 1998


               American General Hospitality Corporation
               Bank Plus Corporation
               Calpine Corporation
               Chris-Craft Industries, Inc.
               Golden State Bancorp, Inc.
               Mid-America Apartment Communities, Inc.
               Public Service Company of New Mexico
               RFS Hotel Investors, Inc.
               Security-Connecticut Corporation
               Shopko Stores, Inc.
               SLM Holding Corporation
               The Vanguard Group, Gemini II Inc. (closed end fund)
               Wang Laboratories, Inc.
               Allmerica Financial Corporation
               BJ's Wholesale Club, Inc.
               Bowne & Co., Inc.
               Caltec Net Lease Realty, Inc.
               Chiquita Brands International, Inc.
               Equity Inns, Inc.
               Harcourt General, Inc.
               Highlands Insurance Group, Inc.
               Horace Mann Educators Corporation
               IPC Holdings, Ltd.
               Long Island Lighting Company
               Moog, Inc.
               National Presto Industries, Inc.
               PFF Bancorp, Inc.
               WMS Industries Inc.
               Woolworth Corporation







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