<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1995 <PERIOD-END> MAR-31-1995 <CASH> 91,380 <SECURITIES> 0 <RECEIVABLES> 123,280 <ALLOWANCES> 620 <INVENTORY> 28,176 <CURRENT-ASSETS> 245,545 <PP&E> 576,373 <DEPRECIATION> 301,343 <TOTAL-ASSETS> 554,948 <CURRENT-LIABILITIES> 163,885 <BONDS> 120,000 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 263,386 <TOTAL-LIABILITY-AND-EQUITY> 554,948 <SALES> 214,806 <TOTAL-REVENUES> 214,806 <CGS> 108,491 <TOTAL-COSTS> 108,491 <OTHER-EXPENSES> 13,212 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 4,085 <INCOME-PRETAX> 83,487 <INCOME-TAX> 0 <INCOME-CONTINUING> 83,487 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 83,487 <EPS-PRIMARY> 2.25 <EPS-DILUTED> 0