<ARTICLE> 5
<MULTIPLIER> 1,000

                                        
<PERIOD-TYPE>                              9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                           1,560
<SECURITIES>                                         0
<RECEIVABLES>                                   28,482
<ALLOWANCES>                                         0
<INVENTORY>                                     27,109
<CURRENT-ASSETS>                                69,839
<PP&E>                                       1,074,581
<DEPRECIATION>                                (509,603)
<TOTAL-ASSETS>                                 658,339
<CURRENT-LIABILITIES>                           56,480
<BONDS>                                        282,600
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         2,774
<OTHER-SE>                                     184,518
<TOTAL-LIABILITY-AND-EQUITY>                   658,339
<SALES>                                        189,141
<TOTAL-REVENUES>                               194,659
<CGS>                                                0
<TOTAL-COSTS>                                  171,525
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              12,742
<INCOME-PRETAX>                                  9,005
<INCOME-TAX>                                     3,512
<INCOME-CONTINUING>                              5,493
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,493
<EPS-BASIC>                                     0.22
<EPS-DILUTED>                                     0.22
<FN>
The information has been prepared in accordance with SFAS No. 128.
Basic and diluted EPS have been entered in place of primary and fully diluted,
respectively.
</FN>