<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
STATEMENT OF INCOME AND BALANCE SHEET, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   YEAR                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1993             DEC-31-1994
<PERIOD-START>                             JAN-01-1994             JAN-01-1995
<PERIOD-END>                               DEC-31-1994             SEP-30-1995
<CASH>                                           6,086                   9,068
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   14,809                  69,074
<ALLOWANCES>                                       226                     226
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                22,104                  91,342
<PP&E>                                         934,460               1,073,981
<DEPRECIATION>                                 496,403                 526,038
<TOTAL-ASSETS>                                 472,700                 662,406
<CURRENT-LIABILITIES>                           16,494                  66,371
<BONDS>                                        119,462                 192,371
<COMMON>                                        14,600                  14,600
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<OTHER-SE>                                     274,286                 326,489
<TOTAL-LIABILITY-AND-EQUITY>                   472,700                 662,406
<SALES>                                         66,735                  78,350
<TOTAL-REVENUES>                                79,068                  96,088
<CGS>                                              973                     773
<TOTAL-COSTS>                                   23,161                  36,256
<OTHER-EXPENSES>                                40,531                  26,667
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               4,023                   6,455
<INCOME-PRETAX>                                  4,274                  20,850
<INCOME-TAX>                                   (5,523)                     386
<INCOME-CONTINUING>                              9,797                  20,464
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                   (987)
<CHANGES>                                            0                       0
<NET-INCOME>                                     9,797                  19,477
<EPS-PRIMARY>                                      .43                     .76
<EPS-DILUTED>                                        0                       0