
<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THE FOLLOWING SCHEDULE CONTAINS RESTATED FINANCIAL DATA SCHEDULES FOR
THE YEAR ENDING DECEMBER 1995 THROUGH THE QUARTER ENDING SEPTEMBER 1997.
THEY ARE RESTATED FOR PRIMARY AND DILUTED EARNINGS PER SHARE FIGURES.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                                    6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                          30,380
<SECURITIES>                                         0
<RECEIVABLES>                                   54,156
<ALLOWANCES>                                     3,648
<INVENTORY>                                        431
<CURRENT-ASSETS>                                85,804
<PP&E>                                          93,191
<DEPRECIATION>                                  32,180
<TOTAL-ASSETS>                                 171,351
<CURRENT-LIABILITIES>                           56,423
<BONDS>                                          5,948
<PREFERRED-MANDATORY>                           10,710
<PREFERRED>                                          0
<COMMON>                                           245
<OTHER-SE>                                      93,523
<TOTAL-LIABILITY-AND-EQUITY>                   171,351
<SALES>                                        136,137
<TOTAL-REVENUES>                               146,942
<CGS>                                           94,988
<TOTAL-COSTS>                                   45,784
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                 2,711
<INTEREST-EXPENSE>                               2,434
<INCOME-PRETAX>                                  3,762
<INCOME-TAX>                                       853
<INCOME-CONTINUING>                              2,313
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,313
<EPS-PRIMARY>                                     0.08
<EPS-DILUTED>                                     0.08
         

</TABLE>
