<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