<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                           3,968
<SECURITIES>                                   132,281
<RECEIVABLES>                                   45,837
<ALLOWANCES>                                     1,356
<INVENTORY>                                     11,009
<CURRENT-ASSETS>                                74,641
<PP&E>                                         262,254
<DEPRECIATION>                                 107,664
<TOTAL-ASSETS>                                 439,522
<CURRENT-LIABILITIES>                           40,387
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        10,678
<OTHER-SE>                                     255,870
<TOTAL-LIABILITY-AND-EQUITY>                   439,522
<SALES>                                        247,958
<TOTAL-REVENUES>                               252,182
<CGS>                                          157,526
<TOTAL-COSTS>                                  157,526
<OTHER-EXPENSES>                                57,056
<LOSS-PROVISION>                                 1,045
<INTEREST-EXPENSE>                               4,451
<INCOME-PRETAX>                                 32,104
<INCOME-TAX>                                    11,047
<INCOME-CONTINUING>                             21,057
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    21,057
<EPS-PRIMARY>                                     2.47
<EPS-DILUTED>                                     2.46