<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> SEP-01-1998 <CASH> 5,318 <SECURITIES> 127,956 <RECEIVABLES> 37,397 <ALLOWANCES> 1,282 <INVENTORY> 13,747 <CURRENT-ASSETS> 70,214 <PP&E> 254,461 <DEPRECIATION> 108,109 <TOTAL-ASSETS> 421,919 <CURRENT-LIABILITIES> 42,952 <BONDS> 51,508 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 10,678 <OTHER-SE> 249,977 <TOTAL-LIABILITY-AND-EQUITY> 421,919 <SALES> 179,465 <TOTAL-REVENUES> 182,490 <CGS> 114,405 <TOTAL-COSTS> 114,405 <OTHER-EXPENSES> 42,293 <LOSS-PROVISION> 592 <INTEREST-EXPENSE> 3,650 <INCOME-PRETAX> 21,550 <INCOME-TAX> 7,526 <INCOME-CONTINUING> 14,024 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 14,024 <EPS-PRIMARY> 1.64 <EPS-DILUTED> 1.64