<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS FOR THE PERIOD ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          19,482
<SECURITIES>                                    13,465
<RECEIVABLES>                                   55,213
<ALLOWANCES>                                       518
<INVENTORY>                                     12,505
<CURRENT-ASSETS>                               111,531
<PP&E>                                         794,332
<DEPRECIATION>                                 376,760
<TOTAL-ASSETS>                                 716,715
<CURRENT-LIABILITIES>                           73,606
<BONDS>                                        384,802
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,756
<OTHER-SE>                                     174,667
<TOTAL-LIABILITY-AND-EQUITY>                   716,715
<SALES>                                              0
<TOTAL-REVENUES>                               174,264
<CGS>                                                0
<TOTAL-COSTS>                                  157,589
<OTHER-EXPENSES>                                15,241
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              15,241
<INCOME-PRETAX>                                 12,355
<INCOME-TAX>                                     4,509
<INCOME-CONTINUING>                              7,846
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,846
<EPS-BASIC>                                     1.20
<EPS-DILUTED>                                     1.20<F1><F2>
<FN>
<F1>Amounts inapplicable or not disclosed as a seperate 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>