<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          16,384
<SECURITIES>                                         0
<RECEIVABLES>                                   97,410
<ALLOWANCES>                                     1,190
<INVENTORY>                                     12,491
<CURRENT-ASSETS>                               142,979
<PP&E>                                       1,716,701
<DEPRECIATION>                                 739,692
<TOTAL-ASSETS>                               1,296,436
<CURRENT-LIABILITIES>                          208,650
<BONDS>                                        434,186
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           924
<OTHER-SE>                                     530,836
<TOTAL-LIABILITY-AND-EQUITY>                 1,296,436
<SALES>                                        118,596
<TOTAL-REVENUES>                               119,716
<CGS>                                                0
<TOTAL-COSTS>                                   29,763
<OTHER-EXPENSES>                                57,762
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              11,593
<INCOME-PRETAX>                                 14,061
<INCOME-TAX>                                     4,462
<INCOME-CONTINUING>                              9,599
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,599
<EPS-PRIMARY>                                      .10
<EPS-DILUTED>                                      .10