<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE COMPANY'S
JUNE 30, 1996 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          14,090
<SECURITIES>                                         0
<RECEIVABLES>                                   64,292
<ALLOWANCES>                                       735
<INVENTORY>                                          0
<CURRENT-ASSETS>                                86,087
<PP&E>                                         108,440
<DEPRECIATION>                                  48,569
<TOTAL-ASSETS>                                 156,382
<CURRENT-LIABILITIES>                           51,274
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           719
<OTHER-SE>                                      97,965
<TOTAL-LIABILITY-AND-EQUITY>                   156,382
<SALES>                                        108,445
<TOTAL-REVENUES>                               108,445
<CGS>                                           76,930
<TOTAL-COSTS>                                   99,030
<OTHER-EXPENSES>                                   738
<LOSS-PROVISION>                                 (256)
<INTEREST-EXPENSE>                                 317
<INCOME-PRETAX>                                  8,677
<INCOME-TAX>                                     3,198
<INCOME-CONTINUING>                              5,479
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,479
<EPS-PRIMARY>                                      .38
<EPS-DILUTED>                                      .38