<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> MAR-31-1998 <CASH> 2,818 <SECURITIES> 167,842 <RECEIVABLES> 37,212 <ALLOWANCES> 1,281 <INVENTORY> 17,180 <CURRENT-ASSETS> 63,873 <PP&E> 246,035 <DEPRECIATION> 103,375 <TOTAL-ASSETS> 446,349 <CURRENT-LIABILITIES> 33,729 <BONDS> 52,286 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 10,676 <OTHER-SE> 269,518 <TOTAL-LIABILITY-AND-EQUITY> 446,349 <SALES> 57,247 <TOTAL-REVENUES> 58,237 <CGS> 37,973 <TOTAL-COSTS> 37,973 <OTHER-EXPENSES> 13,792 <LOSS-PROVISION> 205 <INTEREST-EXPENSE> 1,277 <INCOME-PRETAX> 4,990 <INCOME-TAX> 1,615 <INCOME-CONTINUING> 3,375 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 3,375 <EPS-PRIMARY> .40 <EPS-DILUTED> .39