<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> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<CASH> 7,518,000
<SECURITIES> 19,928,000
<RECEIVABLES> 74,895,000
<ALLOWANCES> 3,557,000
<INVENTORY> 0
<CURRENT-ASSETS> 174,198,000
<PP&E> 278,651,000
<DEPRECIATION> 154,964,000
<TOTAL-ASSETS> 521,760,000
<CURRENT-LIABILITIES> 175,584,000
<BONDS> 0
0
0
<COMMON> 870,000
<OTHER-SE> 237,880,000
<TOTAL-LIABILITY-AND-EQUITY> 521,760,000
<SALES> 546,384,000
<TOTAL-REVENUES> 546,384,000
<CGS> 474,389,000
<TOTAL-COSTS> 474,389,000
<OTHER-EXPENSES> 2,021,000
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 4,811,000
<INCOME-PRETAX> 65,163,000
<INCOME-TAX> 28,856,000
<INCOME-CONTINUING> 71,995,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 36,307,000
<EPS-BASIC> .42
<EPS-DILUTED> .42
</TABLE>