<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> SEP-30-1999 <CASH> 3,504 <SECURITIES> 87,884 <RECEIVABLES> 51,139 <ALLOWANCES> 2,329 <INVENTORY> 17,025 <CURRENT-ASSETS> 91,904 <PP&E> 334,187 <DEPRECIATION> 112,536 <TOTAL-ASSETS> 671,051 <CURRENT-LIABILITIES> 51,495 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 10,688 <OTHER-SE> 233,719 <TOTAL-LIABILITY-AND-EQUITY> 671,051 <SALES> 205,567 <TOTAL-REVENUES> 209,124 <CGS> 126,128 <TOTAL-COSTS> 126,128 <OTHER-EXPENSES> 53,865 <LOSS-PROVISION> 1,800 <INTEREST-EXPENSE> 8,220 <INCOME-PRETAX> 19,111 <INCOME-TAX> 6,387 <INCOME-CONTINUING> 12,724 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 12,724 <EPS-BASIC> 1.49 <EPS-DILUTED> 1.48