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

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                          23,721
<SECURITIES>                                     9,643
<RECEIVABLES>                                   51,653
<ALLOWANCES>                                       296
<INVENTORY>                                     12,605
<CURRENT-ASSETS>                               110,101
<PP&E>                                         838,693
<DEPRECIATION>                                 385,819
<TOTAL-ASSETS>                                 748,140
<CURRENT-LIABILITIES>                           78,900
<BONDS>                                        401,746
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,756
<OTHER-SE>                                     179,778
<TOTAL-LIABILITY-AND-EQUITY>                   748,140
<SALES>                                              0
<TOTAL-REVENUES>                               275,999
<CGS>                                                0
<TOTAL-COSTS>                                  240,229
<OTHER-EXPENSES>                                23,358
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              23,358
<INCOME-PRETAX>                                 23,676
<INCOME-TAX>                                     8,593
<INCOME-CONTINUING>                             15,083
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,083
<EPS-BASIC>                                       2.32
<EPS-DILUTED>                                     2.32<F1><F2>
<FN>
<F1>Amounts inapplicable 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 allowance for
doubtful accounts in the Balance Sheet.
</FN>