<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                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               JUN-30-1997             SEP-30-1997
<CASH>                                           4,302                   4,774
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   24,604                  23,859
<ALLOWANCES>                                        68                      82
<INVENTORY>                                      1,396                   1,221
<CURRENT-ASSETS>                                35,253                  34,893
<PP&E>                                          42,711                  48,015
<DEPRECIATION>                                  15,717                  16,482
<TOTAL-ASSETS>                                  62,675                  66,854
<CURRENT-LIABILITIES>                           17,599                  18,006
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                         4,133                   4,133
<OTHER-SE>                                      39,799                  43,497
<TOTAL-LIABILITY-AND-EQUITY>                    62,675                  66,854
<SALES>                                         65,247                 101,556
<TOTAL-REVENUES>                                65,247                 101,556
<CGS>                                           53,958                  83,282
<TOTAL-COSTS>                                   56,104                  86,544
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 275                     212
<INCOME-PRETAX>                                  8,868                  14,800
<INCOME-TAX>                                     3,120                   5,354
<INCOME-CONTINUING>                              5,748                   9,446
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     5,748                   9,446
<EPS-PRIMARY>                                     0.57                    0.89
<EPS-DILUTED>                                     0.57                    0.89