<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF EARNINGS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                           5,130
<SECURITIES>                                     9,781
<RECEIVABLES>                                   91,375
<ALLOWANCES>                                       682
<INVENTORY>                                     11,067
<CURRENT-ASSETS>                               127,684
<PP&E>                                         711,310
<DEPRECIATION>                                 259,625
<TOTAL-ASSETS>                                 753,748
<CURRENT-LIABILITIES>                           93,929
<BONDS>                                        292,221
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,091
<OTHER-SE>                                     261,856
<TOTAL-LIABILITY-AND-EQUITY>                   753,748
<SALES>                                         39,361
<TOTAL-REVENUES>                               385,772
<CGS>                                           30,873
<TOTAL-COSTS>                                  239,792
<OTHER-EXPENSES>                                88,823
<LOSS-PROVISION>                                     5
<INTEREST-EXPENSE>                              17,916
<INCOME-PRETAX>                                 42,410
<INCOME-TAX>                                    17,385
<INCOME-CONTINUING>                             25,025
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    25,025
<EPS-BASIC>                                       1.02
<EPS-DILUTED>                                     1.01