
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEET 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-31-1997
<PERIOD-START>                              JAN-1-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                          15,983
<SECURITIES>                                         0
<RECEIVABLES>                                   26,397
<ALLOWANCES>                                   (1,539)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                74,428
<PP&E>                                          98,665
<DEPRECIATION>                                (48,723)
<TOTAL-ASSETS>                                 155,219
<CURRENT-LIABILITIES>                           54,683
<BONDS>                                         33,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           185
<OTHER-SE>                                      61,087
<TOTAL-LIABILITY-AND-EQUITY>                   155,219
<SALES>                                              0
<TOTAL-REVENUES>                                63,504
<CGS>                                                0
<TOTAL-COSTS>                                   51,830
<OTHER-EXPENSES>                                 3,394
<LOSS-PROVISION>                                   189
<INTEREST-EXPENSE>                                 279
<INCOME-PRETAX>                                  8,001
<INCOME-TAX>                                     3,200
<INCOME-CONTINUING>                              4,801
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,801
<EPS-PRIMARY>                                      .25
<EPS-DILUTED>                                      .25
        

</TABLE>
