<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FINANCIAL STATEMENTS INCLUDED IN THIS REGISTRATION STATEMENT ON FORM
S-1, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> MAR-31-2000
<CASH> 14,468,000
<SECURITIES> 20,094,000
<RECEIVABLES> 70,428,000
<ALLOWANCES> 3,964,000
<INVENTORY> 0
<CURRENT-ASSETS> 178,478,000
<PP&E> 305,708,000
<DEPRECIATION> 184,258,000
<TOTAL-ASSETS> 535,402,000
<CURRENT-LIABILITIES> 177,528,000
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 250,390,000
<TOTAL-LIABILITY-AND-EQUITY> 535,402,000
<SALES> 144,776,000
<TOTAL-REVENUES> 144,776,000
<CGS> 125,549,000
<TOTAL-COSTS> 125,549,000
<OTHER-EXPENSES> 199,000
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 1,594,000
<INCOME-PRETAX> 17,434,000
<INCOME-TAX> 7,398,000
<INCOME-CONTINUING> 19,028,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 10,036,000
<EPS-BASIC> 200,720
<EPS-DILUTED> 200,720
</TABLE>