<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S SEC FORM 10-Q FOR THE PERIOD ENDING JUNE 30, 1995 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               JUN-30-1995
<CASH>                                          14,687
<SECURITIES>                                         0
<RECEIVABLES>                                   73,263
<ALLOWANCES>                                         1
<INVENTORY>                                     40,252
<CURRENT-ASSETS>                               173,638
<PP&E>                                       2,497,852
<DEPRECIATION>                               1,215,676
<TOTAL-ASSETS>                               1,577,553
<CURRENT-LIABILITIES>                          252,268
<BONDS>                                        430,362
<COMMON>                                         4,391
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     412,049
<TOTAL-LIABILITY-AND-EQUITY>                 1,577,553
<SALES>                                        439,982
<TOTAL-REVENUES>                               451,253
<CGS>                                          153,563
<TOTAL-COSTS>                                  250,491
<OTHER-EXPENSES>                                37,649
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,510
<INCOME-PRETAX>                                152,603
<INCOME-TAX>                                    85,825
<INCOME-CONTINUING>                             66,778
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    66,778
<EPS-PRIMARY>                                      .76
<EPS-DILUTED>                                        0