<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS FOR THE PERIOD ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          26,096
<SECURITIES>                                    11,161
<RECEIVABLES>                                   45,688
<ALLOWANCES>                                       105
<INVENTORY>                                     14,214
<CURRENT-ASSETS>                               102,175
<PP&E>                                         789,233
<DEPRECIATION>                                 330,530
<TOTAL-ASSETS>                                 642,036
<CURRENT-LIABILITIES>                           71,430
<BONDS>                                        327,234
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,756
<OTHER-SE>                                     166,676
<TOTAL-LIABILITY-AND-EQUITY>                   642,036
<SALES>                                              0
<TOTAL-REVENUES>                               188,486
<CGS>                                                0
<TOTAL-COSTS>                                  170,882
<OTHER-EXPENSES>                                14,331
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              14,331
<INCOME-PRETAX>                                  4,169
<INCOME-TAX>                                     1,624
<INCOME-CONTINUING>                              2,545
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                (1,029)
<CHANGES>                                            0
<NET-INCOME>                                     1,516
<EPS-PRIMARY>                                     0.23
<EPS-DILUTED>                                     0.23<F1><F2>
<FN>
<F1>AMOUNTS INAPLICABLE OR NOT DISCLOSED AS A SEPARATE LINE ON THE BALANCE SHEET OR
STATEMENT OF INCOME ARE REPORTED AS 0 HEREIN.
<F2>NOTES AND ACCOUNTS RECEIVABLE- TRADE ARE REPORTED NET OF ALLOWANCES FOR
DOUBTFUL ACCOUNTS IN THE BALANCE SHEET.
</FN>