<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM APPLICABLE
FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                           5,532
<SECURITIES>                                         0
<RECEIVABLES>                                   58,983
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                79,035
<PP&E>                                       1,246,448
<DEPRECIATION>                               (748,034)
<TOTAL-ASSETS>                                 612,938
<CURRENT-LIABILITIES>                           83,400
<BONDS>                                        231,315
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         1,271
<OTHER-SE>                                     244,580
<TOTAL-LIABILITY-AND-EQUITY>                   612,938
<SALES>                                              0
<TOTAL-REVENUES>                               123,074
<CGS>                                                0
<TOTAL-COSTS>                                  134,727
<OTHER-EXPENSES>                                    14
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,024
<INCOME-PRETAX>                               (21,329)
<INCOME-TAX>                                     1,572
<INCOME-CONTINUING>                           (29,433)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (29,433)
<EPS-PRIMARY>                                    (.23)
<EPS-DILUTED>                                    (.23)