<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> SEP-30-1997 <CASH> 18,800 <SECURITIES> 0 <RECEIVABLES> 144,600 <ALLOWANCES> 13,600 <INVENTORY> 11,700 <CURRENT-ASSETS> 175,900 <PP&E> 1,215,600 <DEPRECIATION> 413,800 <TOTAL-ASSETS> 1,348,000 <CURRENT-LIABILITIES> 436,100 <BONDS> 64,300 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 1,000 <OTHER-SE> 749,800 <TOTAL-LIABILITY-AND-EQUITY> 1,348,000 <SALES> 0 <TOTAL-REVENUES> 834,500 <CGS> 0 <TOTAL-COSTS> 603,100 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 20,600 <INCOME-PRETAX> 127,900 <INCOME-TAX> 46,300 <INCOME-CONTINUING> 81,600 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 81,600 <EPS-PRIMARY> .85 <EPS-DILUTED> .85