<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S JUNE 30, 1998 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-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          10,430
<SECURITIES>                                         0
<RECEIVABLES>                                   63,481
<ALLOWANCES>                                     1,338
<INVENTORY>                                          0
<CURRENT-ASSETS>                                94,268
<PP&E>                                         138,270
<DEPRECIATION>                                  61,515
<TOTAL-ASSETS>                                 186,363
<CURRENT-LIABILITIES>                           53,269
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           752
<OTHER-SE>                                     126,166
<TOTAL-LIABILITY-AND-EQUITY>                   186,363
<SALES>                                        140,587
<TOTAL-REVENUES>                               140,587
<CGS>                                          101,766
<TOTAL-COSTS>                                  130,480
<OTHER-EXPENSES>                                   889
<LOSS-PROVISION>                                   462
<INTEREST-EXPENSE>                                 745
<INCOME-PRETAX>                                  8,858
<INCOME-TAX>                                     2,030
<INCOME-CONTINUING>                              6,828
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,828
<EPS-PRIMARY>                                      .45
<EPS-DILUTED>                                      .45