<ARTICLE> 5
<MULTIPLIER> 1000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                           43310
<SECURITIES>                                      2204
<RECEIVABLES>                                    45431
<ALLOWANCES>                                       226
<INVENTORY>                                      13485
<CURRENT-ASSETS>                                113354
<PP&E>                                          729854
<DEPRECIATION>                                  294759
<TOTAL-ASSETS>                                  641062
<CURRENT-LIABILITIES>                            97460
<BONDS>                                         303593
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                          6756
<OTHER-SE>                                      166116
<TOTAL-LIABILITY-AND-EQUITY>                    641062
<SALES>                                              0
<TOTAL-REVENUES>                                192514
<CGS>                                                0
<TOTAL-COSTS>                                   176970
<OTHER-EXPENSES>                                 13942
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               13942
<INCOME-PRETAX>                                   2337
<INCOME-TAX>                                      1067
<INCOME-CONTINUING>                               1270
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      1270
<EPS-PRIMARY>                                     0.19
<EPS-DILUTED>                                     0.19
<FN>
<F1>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL 
STATEMENTS FOR THE PERIOD ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMEMTS.
<F2>
Amounts inapplicable or not disclosed as a separate line on the Balance Sheet
or Statement of Income are reported as 0 herein.
<F3>
Notes and accounts receivable-trade are reported net of allowances for doubtful 
accounts in the Balance Sheet.
</FN>