<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
unaudited consolidated balance sheet at June 30, 1997 and the unaudited
consolidated statements of operations for the six months ended June 30, 1997.
Earnings per share information has been restated persuant to SFAS 128,
"Earnings per Share".
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                           4,160
<SECURITIES>                                         0
<RECEIVABLES>                                   33,163
<ALLOWANCES>                                   (1,085)
<INVENTORY>                                      2,309
<CURRENT-ASSETS>                                42,806
<PP&E>                                         949,756
<DEPRECIATION>                               (259,776)
<TOTAL-ASSETS>                                 738,176
<CURRENT-LIABILITIES>                           41,540
<BONDS>                                        335,980
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           278
<OTHER-SE>                                     281,672
<TOTAL-LIABILITY-AND-EQUITY>                   738,176
<SALES>                                         96,102
<TOTAL-REVENUES>                               106,002
<CGS>                                           21,865
<TOTAL-COSTS>                                   77,940
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              12,519
<INCOME-PRETAX>                                 28,062
<INCOME-TAX>                                     9,822
<INCOME-CONTINUING>                             18,240
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    18,240
<EPS-PRIMARY>                                      .66
<EPS-DILUTED>                                      .65