<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from consolidated
financial statements 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>                                           3,623
<SECURITIES>                                         0
<RECEIVABLES>                                   37,370
<ALLOWANCES>                                         0
<INVENTORY>                                      1,072
<CURRENT-ASSETS>                                46,289
<PP&E>                                          59,260
<DEPRECIATION>                                  19,429
<TOTAL-ASSETS>                                  90,593
<CURRENT-LIABILITIES>                           28,400
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         4,162
<OTHER-SE>                                      56,120
<TOTAL-LIABILITY-AND-EQUITY>                    90,593
<SALES>                                         97,555
<TOTAL-REVENUES>                                97,555
<CGS>                                           79,477
<TOTAL-COSTS>                                   82,551
<OTHER-EXPENSES>                                  (89)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  57
<INCOME-PRETAX>                                 15,036
<INCOME-TAX>                                     5,652
<INCOME-CONTINUING>                              9,384
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,384
<EPS-PRIMARY>                                     0.81
<EPS-DILUTED>                                     0.80