<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   YEAR
YEAR
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1995             DEC-31-1995             DEC-31-1995
             DEC-31-1994
<PERIOD-END>                               MAR-31-1995             JUN-30-1995             SEP-30-1995             DEC-31-1995
             DEC-31-1994
<CASH>                                           1,605                     874                   4,204                     711
                     975
<SECURITIES>                                         0                       0                       0                       0
                       0
<RECEIVABLES>                                  138,038                  85,499                 102,174                  96,798
                 122,514
<ALLOWANCES>                                         0                       0                       0                       0
                       0
<INVENTORY>                                     21,184                  24,516                  22,572                  21,625
                  20,930
<CURRENT-ASSETS>                               304,595                 280,537                 315,140                 262,957
                 361,043
<PP&E>                                       2,292,453               2,300,976               2,298,596               2,315,003
               2,241,972
<DEPRECIATION>                               1,491,091               1,503,918               1,504,977               1,504,087
               1,460,649
<TOTAL-ASSETS>                               1,385,256               1,396,345               1,410,620               1,437,709
               1,375,210
<CURRENT-LIABILITIES>                          114,694                 104,040                 108,011                 130,446
                 138,100
<BONDS>                                        318,587                 318,267                 317,947                 317,627
                 323,907
<PREFERRED-MANDATORY>                                0                       0                       0                       0
                       0
<PREFERRED>                                          0                       0                       0                       0
                       0
<COMMON>                                             4                       4                       4                       4
                       4
<OTHER-SE>                                     557,720                 565,502                 571,906                 574,094
                 519,220
<TOTAL-LIABILITY-AND-EQUITY>                 1,385,256               1,396,345               1,410,620               1,437,709
               1,375,210
<SALES>                                              0                       0                       0                       0
                       0
<TOTAL-REVENUES>                               113,147                 209,349                 306,875                 412,326
                 381,883
<CGS>                                                0                       0                       0                       0
                       0
<TOTAL-COSTS>                                   19,273                  40,300                  63,538                  96,097
                 151,732
<OTHER-EXPENSES>                                14,858                  27,524                  39,781                  52,274
                  46,576
<LOSS-PROVISION>                                     0                       0                       0                       0
                       0
<INTEREST-EXPENSE>                              10,284                  20,860                  31,459                  43,218
                  41,452
<INCOME-PRETAX>                                 47,032                  79,817                 110,352                 134,124
                  76,098
<INCOME-TAX>                                    18,113                  30,717                  42,447                  51,631
                  28,274
<INCOME-CONTINUING>                             28,919                  49,100                  67,905                  82,493
                  47,824
<DISCONTINUED>                                       0                       0                       0                       0
                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
                       0
<CHANGES>                                            0                       0                       0                       0
                       0
<NET-INCOME>                                    28,919                  49,100                  67,905                  82,493
                  47,824
<EPS-PRIMARY>                                        0                       0                       0                       0
                       0
<EPS-DILUTED>                                        0                       0                       0                       0
                       0
        

</TABLE>