<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> SEP-30-1997 <CASH> 4,905 <SECURITIES> 163,068 <RECEIVABLES> 42,312 <ALLOWANCES> 1,374 <INVENTORY> 14,410 <CURRENT-ASSETS> 75,653 <PP&E> 239,707 <DEPRECIATION> 98,632 <TOTAL-ASSETS> 443,368 <CURRENT-LIABILITIES> 37,471 <BONDS> 59,914 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 10,669 <OTHER-SE> 228,654 <TOTAL-LIABILITY-AND-EQUITY> 443,368 <SALES> 188,922 <TOTAL-REVENUES> 191,695 <CGS> 122,483 <TOTAL-COSTS> 122,483 <OTHER-EXPENSES> 39,505 <LOSS-PROVISION> 791 <INTEREST-EXPENSE> 4,147 <INCOME-PRETAX> 24,769 <INCOME-TAX> 8,454 <INCOME-CONTINUING> 16,315 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 16,315 <EPS-PRIMARY> 3.80 <EPS-DILUTED> 0