<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S SEC FORM 10-Q FOR THE PERIOD ENDING MARCH 31, 1995 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               MAR-31-1995
<CASH>                                          13,630
<SECURITIES>                                         0
<RECEIVABLES>                                   66,036
<ALLOWANCES>                                         3
<INVENTORY>                                     41,988
<CURRENT-ASSETS>                               149,309
<PP&E>                                       2,485,126
<DEPRECIATION>                               1,189,875
<TOTAL-ASSETS>                               1,563,956
<CURRENT-LIABILITIES>                          242,415
<BONDS>                                        436,266
<COMMON>                                         4,391
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     398,522
<TOTAL-LIABILITY-AND-EQUITY>                 1,563,956
<SALES>                                        239,558
<TOTAL-REVENUES>                               245,673
<CGS>                                           79,177
<TOTAL-COSTS>                                  131,891
<OTHER-EXPENSES>                                15,550
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               5,269
<INCOME-PRETAX>                                 92,963
<INCOME-TAX>                                    46,286
<INCOME-CONTINUING>                             46,677
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    46,677
<EPS-PRIMARY>                                      .53
<EPS-DILUTED>                                        0