<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
ACCOMPANYING FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
*** (COLUMNAR AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA) ***
</LEGEND>
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          15,150
<SECURITIES>                                         0
<RECEIVABLES>                                   61,448
<ALLOWANCES>                                         0
<INVENTORY>                                      9,570
<CURRENT-ASSETS>                                91,726
<PP&E>                                         380,387
<DEPRECIATION>                                 128,739
<TOTAL-ASSETS>                                 391,819
<CURRENT-LIABILITIES>                           66,180
<BONDS>                                        106,469
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           123
<OTHER-SE>                                     174,348
<TOTAL-LIABILITY-AND-EQUITY>                   391,819
<SALES>                                        149,725
<TOTAL-REVENUES>                               149,725
<CGS>                                          109,185
<TOTAL-COSTS>                                  109,185
<OTHER-EXPENSES>                                 7,498
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               7,979
<INCOME-PRETAX>                                 25,299
<INCOME-TAX>                                      (739)
<INCOME-CONTINUING>                             24,680
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    24,680
<EPS-PRIMARY>                                     2.01
<EPS-DILUTED>                                     2.01