<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
1996 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-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                           5,569
<SECURITIES>                                         0
<RECEIVABLES>                                   50,136
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 9,240
<PP&E>                                         841,986
<DEPRECIATION>                                 238,890
<TOTAL-ASSETS>                                 678,502
<CURRENT-LIABILITIES>                           62,258
<BONDS>                                        323,752
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           120
<OTHER-SE>                                     242,007
<TOTAL-LIABILITY-AND-EQUITY>                   678,502
<SALES>                                        146,859
<TOTAL-REVENUES>                               147,383
<CGS>                                           65,894
<TOTAL-COSTS>                                   65,894
<OTHER-EXPENSES>                                41,738
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              14,737
<INCOME-PRETAX>                                 25,014
<INCOME-TAX>                                     7,846
<INCOME-CONTINUING>                             16,970
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    16,970
<EPS-PRIMARY>                                      .70
<EPS-DILUTED>                                      .70