<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                          28,838                  16,635
<SECURITIES>                                     2,207                   1,527
<RECEIVABLES>                                    4,164                   5,872
<ALLOWANCES>                                        95                     154
<INVENTORY>                                      8,595                   5,436
<CURRENT-ASSETS>                                45,769                  31,702
<PP&E>                                          73,556                  59,890
<DEPRECIATION>                                  33,910                  30,988
<TOTAL-ASSETS>                                 225,375                 180,078
<CURRENT-LIABILITIES>                            7,798                   5,944
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                           30,000                       0
<PREFERRED>                                          0                       0
<COMMON>                                           128                     128
<OTHER-SE>                                     179,868                 166,580
<TOTAL-LIABILITY-AND-EQUITY>                   225,375                 180,078
<SALES>                                        104,208                  86,498
<TOTAL-REVENUES>                               106,221                  90,775
<CGS>                                           67,625                  61,076
<TOTAL-COSTS>                                   72,537                  65,185
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 370                     284
<INCOME-PRETAX>                                 27,252                  21,933
<INCOME-TAX>                                    10,678                   8,772
<INCOME-CONTINUING>                             16,574                  13,161
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    16,574                  13,161
<EPS-PRIMARY>                                     1.29                    1.03
<EPS-DILUTED>                                     1.29                    1.03