
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF INCOME AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                           17247
<SECURITIES>                                         0
<RECEIVABLES>                                    28776
<ALLOWANCES>                                    (1200)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 74047
<PP&E>                                          104304
<DEPRECIATION>                                 (51734)
<TOTAL-ASSETS>                                  164802
<CURRENT-LIABILITIES>                            73034
<BONDS>                                          31000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           179
<OTHER-SE>                                       52407
<TOTAL-LIABILITY-AND-EQUITY>                    164802
<SALES>                                              0
<TOTAL-REVENUES>                                 81871
<CGS>                                                0
<TOTAL-COSTS>                                    66209
<OTHER-EXPENSES>                                  3222
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 712
<INCOME-PRETAX>                                  12458
<INCOME-TAX>                                      4681
<INCOME-CONTINUING>                               7597
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      7597
<EPS-PRIMARY>                                      .43
<EPS-DILUTED>                                      .40
        

</TABLE>
