<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FILED AS PART OF THE ANNUAL REPORT ON FORM 10-K AND IS QUALIFIED IN ITS ENTIRETY BY SUCH ANNUAL REPORT ON FORM 10-K </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <CASH> $34,322 <SECURITIES> $0 <RECEIVABLES> $156,870 <ALLOWANCES> $2,449 <INVENTORY> $90,283 <CURRENT-ASSETS> $296,736 <PP&E> $1,188,252 <DEPRECIATION> $691,612 <TOTAL-ASSETS> $888,181 <CURRENT-LIABILITIES> $112,560 <BONDS> $0 <PREFERRED-MANDATORY> $0 <PREFERRED> $0 <COMMON> $539 <OTHER-SE> $516,797 <TOTAL-LIABILITY-AND-EQUITY> $888,181 <SALES> $829,850 <TOTAL-REVENUES> $829,850 <CGS> $568,424 <TOTAL-COSTS> $709,143 <OTHER-EXPENSES> $0 <LOSS-PROVISION> $0 <INTEREST-EXPENSE> $719 <INCOME-PRETAX> $120,905 <INCOME-TAX> $40,923 <INCOME-CONTINUING> $79,982 <DISCONTINUED> $0 <EXTRAORDINARY> $0 <CHANGES> $0 <NET-INCOME> $79,982 <EPS-PRIMARY> $1.45 <EPS-DILUTED> $1.44