<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> 38,758 <SECURITIES> 0 <RECEIVABLES> 92,382 <ALLOWANCES> 0 <INVENTORY> 2,351 <CURRENT-ASSETS> 147,076 <PP&E> 1,733,776 <DEPRECIATION> (870,350) <TOTAL-ASSETS> 1,038,031 <CURRENT-LIABILITIES> 121,278 <BONDS> 377,001 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 172,852 <OTHER-SE> 261,788 <TOTAL-LIABILITY-AND-EQUITY> 1,038,031 <SALES> 167,216 <TOTAL-REVENUES> 170,423 <CGS> 52,114 <TOTAL-COSTS> 130,013 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 5,348 <INCOME-PRETAX> 35,627 <INCOME-TAX> 12,948 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 22,679 <EPS-PRIMARY> .45 <EPS-DILUTED> .43