<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           4,603
<SECURITIES>                                         0
<RECEIVABLES>                                   45,752
<ALLOWANCES>                                         0
<INVENTORY>                                     20,465
<CURRENT-ASSETS>                                87,955
<PP&E>                                         969,940
<DEPRECIATION>                                 366,638
<TOTAL-ASSETS>                                 710,866
<CURRENT-LIABILITIES>                           48,989
<BONDS>                                        296,472
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         2,774
<OTHER-SE>                                     218,791
<TOTAL-LIABILITY-AND-EQUITY>                   710,866
<SALES>                                        269,991
<TOTAL-REVENUES>                               276,189
<CGS>                                                0
<TOTAL-COSTS>                                  224,253
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              16,414
<INCOME-PRETAX>                                 30,505
<INCOME-TAX>                                    11,790
<INCOME-CONTINUING>                             18,715
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0  
<CHANGES>                                            0
<NET-INCOME>                                    18,715
<EPS-PRIMARY>                                      .76
<EPS-DILUTED>                                      .76
<FN>
The information has been prepared in accordance with SFAS No. 128. 
Basic and diluted EPS have been entered in place of primary and fully diluted,
respectively.
</FN>