<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
1998 FORM 10-Q 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-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                           3,022
<SECURITIES>                                         0
<RECEIVABLES>                                   60,515
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                75,938
<PP&E>                                       1,281,242
<DEPRECIATION>                                 426,474
<TOTAL-ASSETS>                                 956,129
<CURRENT-LIABILITIES>                           72,003
<BONDS>                                        525,351
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           258
<OTHER-SE>                                     325,148
<TOTAL-LIABILITY-AND-EQUITY>                   956,129
<SALES>                                        174,389
<TOTAL-REVENUES>                               174,926
<CGS>                                          104,732
<TOTAL-COSTS>                                  104,732
<OTHER-EXPENSES>                                69,584
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              19,270
<INCOME-PRETAX>                                (18,660)
<INCOME-TAX>                                    (7,570)
<INCOME-CONTINUING>                            (11,090)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (11,090)
<EPS-PRIMARY>                                     (.21)
<EPS-DILUTED>                                     (.21)