<ARTICLE> 5 <LEGEND> This schedule contains summary financial information extracted from the consolidated statement of earnings and the consolidated balance sheets and is qualified in its entirety by reference to such financial statements. </LEGEND> <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> MAR-31-1997 <EXCHANGE-RATE> 1 <CASH> 174,492 <SECURITIES> 0 <RECEIVABLES> 167,921 <ALLOWANCES> 18,075 <INVENTORY> 37,452 <CURRENT-ASSETS> 393,823 <PP&E> 1,456,749 <DEPRECIATION> 629,376 <TOTAL-ASSETS> 1,393,005 <CURRENT-LIABILITIES> 213,083 <BONDS> 346,081 <COMMON> 20,443 <PREFERRED-MANDATORY> 29,301 <PREFERRED> 0 <OTHER-SE> 429,061 <TOTAL-LIABILITY-AND-EQUITY> 1,393,005 <SALES> 312,538 <TOTAL-REVENUES> 376,920 <CGS> 239,099 <TOTAL-COSTS> 294,646 <OTHER-EXPENSES> 21,761 <LOSS-PROVISION> 6,735 <INTEREST-EXPENSE> 8,790 <INCOME-PRETAX> 44,988 <INCOME-TAX> 16,765 <INCOME-CONTINUING> 28,223 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 28,223 <EPS-PRIMARY> 1.38 <EPS-DILUTED> 1.38