<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> DEC-31-1997 <CASH> 6,337 <SECURITIES> 149,616 <RECEIVABLES> 45,882 <ALLOWANCES> 1,259 <INVENTORY> 14,537 <CURRENT-ASSETS> 79,331 <PP&E> 242,911 <DEPRECIATION> 100,455 <TOTAL-ASSETS> 438,753 <CURRENT-LIABILITIES> 42,995 <BONDS> 55,615 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 10,669 <OTHER-SE> 256,182 <TOTAL-LIABILITY-AND-EQUITY> 438,753 <SALES> 256,179 <TOTAL-REVENUES> 260,034 <CGS> 162,715 <TOTAL-COSTS> 162,715 <OTHER-EXPENSES> 52,997 <LOSS-PROVISION> 1,043 <INTEREST-EXPENSE> 5,467 <INCOME-PRETAX> 37,812 <INCOME-TAX> 13,083 <INCOME-CONTINUING> 24,729 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 24,729 <EPS-PRIMARY> 2.90<F1> <EPS-DILUTED> 2.88<F1> <FN> <F1>Per share amounts are adjusted to reflect 2-for-1 stock split effective March 6, 1998. </FN>