<ARTICLE>                     5
<MULTIPLIER>                  1,000

                                                           
<PERIOD-TYPE>                 3-MOS                              3-MOS
<FISCAL-YEAR-END>                              DEC-31-2000                      DEC-31-1999
<PERIOD-START>                                 JUL-01-2000                      JUL-01-1999
<PERIOD-END>                                   SEP-30-2000                      SEP-30-1999
<CASH>                                           1,144                            4,868
<SECURITIES>                                         0                                0
<RECEIVABLES>                                   21,895                           21,923
<ALLOWANCES>                                       657                              685
<INVENTORY>                                      2,390                            2,282
<CURRENT-ASSETS>                                42,315                           45,634
<PP&E>                                         839,966                          795,441
<DEPRECIATION>                                 264,757                          244,723
<TOTAL-ASSETS>                                 660,914                          642,272
<CURRENT-LIABILITIES>                           75,616                           60,893
<BONDS>                                        169,470                          171,092
<PREFERRED-MANDATORY>                                0                                0
<PREFERRED>                                      3,475                            3,475
<COMMON>                                       199,533                          194,655
<OTHER-SE>                                           0                                0
<TOTAL-LIABILITY-AND-EQUITY>                   660,914                          642,272
<SALES>                                         76,580                           72,280
<TOTAL-REVENUES>                                76,580                           72,280
<CGS>                                           57,937                           54,932
<TOTAL-COSTS>                                   57,937                           54,932
<OTHER-EXPENSES>                                  (358)                            (319)
<LOSS-PROVISION>                                   136                              168
<INTEREST-EXPENSE>                               3,935                            3,535
<INCOME-PRETAX>                                 15,066                           14,132
<INCOME-TAX>                                     5,861                            5,426
<INCOME-CONTINUING>                              9,205                            8,706
<DISCONTINUED>                                       0                                0
<EXTRAORDINARY>                                      0                                0
<CHANGES>                                            0                                0
<NET-INCOME>                                     9,205                            8,706
<EPS-BASIC>                                       0.60                             0.57
<EPS-DILUTED>                                     0.60                             0.57