<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION FROM CONSOLIDATED FINANCIAL
STATMENTS FOR THE PERIOD ENDED MARCH 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-END>                               MAR-31-1998             MAR-31-1997
<CASH>                                           1,231                  19,397
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   25,894                  18,832    
<ALLOWANCES>                                       700                     480
<INVENTORY>                                      6,009                   4,592
<CURRENT-ASSETS>                                59,637                  57,745
<PP&E>                                          69,301                  43,305
<DEPRECIATION>                                  30,414                  24,286
<TOTAL-ASSETS>                                 143,845                 115,267 
<CURRENT-LIABILITIES>                           38,129                  18,032
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                         1,824                   1,807
<OTHER-SE>                                      88,840                  84,664
<TOTAL-LIABILITY-AND-EQUITY>                   143,845                 115,267
<SALES>                                         36,017                  28,576
<TOTAL-REVENUES>                                36,017                  28,576
<CGS>                                           24,956                  19,822
<TOTAL-COSTS>                                   34,471                  27,975
<OTHER-EXPENSES>                                   444                     205
<LOSS-PROVISION>                                   141                       7
<INTEREST-EXPENSE>                                 554                     311
<INCOME-PRETAX>                                  1,102                     396
<INCOME-TAX>                                       475                     170
<INCOME-CONTINUING>                                627                     226
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       627                     226
<EPS-PRIMARY>                                      .06                     .03
<EPS-DILUTED>                                      .06                     .03