<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
RESPECTIVE CONSOLIDATED FINANCIAL STATEMENTS OF THE COMPANY FOR THE FISCAL
QUARTERS ENDED MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERNCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           4,048                   5,709                   5,109
<SECURITIES>                                    75,276                  65,413                  67,292
<RECEIVABLES>                                   16,362                  14,346                  16,391
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                     17,143                  16,748                  14,957
<CURRENT-ASSETS>                               112,953                 102,321                 104,008
<PP&E>                                         134,783                 132,967                 130,199
<DEPRECIATION>                                       0                       0                       0
<TOTAL-ASSETS>                                 268,708                 255,617                 254,511
<CURRENT-LIABILITIES>                           64,584                  56,388                  54,206
<BONDS>                                         12,682                  13,891                  14,259
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        87,606                  87,522                  87,672
<OTHER-SE>                                      96,504                  92,269                  94,699
<TOTAL-LIABILITY-AND-EQUITY>                   268,708                 255,617                 254,511
<SALES>                                         42,132                  84,719                 130,234
<TOTAL-REVENUES>                                44,354                  90,094                 138,400
<CGS>                                           34,468                  69,259                 106,587
<TOTAL-COSTS>                                   41,156                  82,771                 126,310
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                 884                   1,403                   2,149
<INCOME-PRETAX>                                  3,198                   7,323                  12,090
<INCOME-TAX>                                        14                      28                      41
<INCOME-CONTINUING>                              3,184                   7,295                  12,049
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     3,184                   7,295                  12,049
<EPS-PRIMARY>                                     0.21                    0.49                    0.80
<EPS-DILUTED>                                     0.21                    0.49                    0.80
        

</TABLE>