<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED FINANCIAL STATEMENTS FOR THE SIX MONTH PERIOD ENDED JUNE 30, 1997, AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                           1,421
<SECURITIES>                                         0
<RECEIVABLES>                                   25,541
<ALLOWANCES>                                     1,186
<INVENTORY>                                          0
<CURRENT-ASSETS>                                49,652
<PP&E>                                       1,598,551
<DEPRECIATION>                                 310,012
<TOTAL-ASSETS>                               1,350,510
<CURRENT-LIABILITIES>                          108,101
<BONDS>                                        797,561
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         8,454
<OTHER-SE>                                     398,793
<TOTAL-LIABILITY-AND-EQUITY>                 1,350,510
<SALES>                                              0
<TOTAL-REVENUES>                               249,019
<CGS>                                                0
<TOTAL-COSTS>                                  119,819
<OTHER-EXPENSES>                                28,479
<LOSS-PROVISION>                                  (21)
<INTEREST-EXPENSE>                              23,940
<INCOME-PRETAX>                                 67,118
<INCOME-TAX>                                    24,834
<INCOME-CONTINUING>                             42,284
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    42,284
<EPS-PRIMARY>                                      .53
<EPS-DILUTED>                                      .53