<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S REPORT ON FORM 10-Q FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          13,002
<SECURITIES>                                         0
<RECEIVABLES>                                  154,295
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               197,561
<PP&E>                                       1,163,258
<DEPRECIATION>                                 409,509
<TOTAL-ASSETS>                                 978,307
<CURRENT-LIABILITIES>                          167,981
<BONDS>                                              0
<PREFERRED-MANDATORY>                              390
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                   978,307
<SALES>                                      1,139,059
<TOTAL-REVENUES>                             1,139,059
<CGS>                                                0
<TOTAL-COSTS>                                1,113,447
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              18,588
<INCOME-PRETAX>                                  7,024
<INCOME-TAX>                                     2,669
<INCOME-CONTINUING>                              4,355
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,355
<EPS-PRIMARY>                                      .12
<EPS-DILUTED>                                      .12