<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          34,383
<SECURITIES>                                         0
<RECEIVABLES>                                  260,059
<ALLOWANCES>                                     9,731
<INVENTORY>                                    171,919
<CURRENT-ASSETS>                               537,592
<PP&E>                                       5,864,315
<DEPRECIATION>                               3,546,231
<TOTAL-ASSETS>                               4,124,254
<CURRENT-LIABILITIES>                          392,947
<BONDS>                                      2,288,210
<COMMON>                                        43,507
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     925,569
<TOTAL-LIABILITY-AND-EQUITY>                 4,124,254
<SALES>                                      2,364,732
<TOTAL-REVENUES>                             2,486,846
<CGS>                                        1,421,731
<TOTAL-COSTS>                                1,466,002
<OTHER-EXPENSES>                               325,279
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             177,420
<INCOME-PRETAX>                                169,126
<INCOME-TAX>                                    35,228
<INCOME-CONTINUING>                            133,898
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   133,898
<EPS-PRIMARY>                                     2.88
<EPS-DILUTED>                                     2.88