<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-START> JAN-01-1996 <PERIOD-END> MAR-31-1996 <CASH> 22,857 <SECURITIES> 0 <RECEIVABLES> 175,519 <ALLOWANCES> 0 <INVENTORY> 65,719 <CURRENT-ASSETS> 372,816 <PP&E> 933,802 <DEPRECIATION> 457,692 <TOTAL-ASSETS> 1,279,943 <CURRENT-LIABILITIES> 365,164 <BONDS> 110,514 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 82,363 <OTHER-SE> 685,476 <TOTAL-LIABILITY-AND-EQUITY> 1,279,943 <SALES> 488,088 <TOTAL-REVENUES> 488,088 <CGS> 250,662 <TOTAL-COSTS> 454,142 <OTHER-EXPENSES> (1,113) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,788 <INCOME-PRETAX> 32,271 <INCOME-TAX> 13,350 <INCOME-CONTINUING> 18,921 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 18,921 <EPS-PRIMARY> 0.23 <EPS-DILUTED> 0.23