<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS INCLUDED IN THE ACCOMPANYING 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-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                         154,759
<SECURITIES>                                    40,064
<RECEIVABLES>                                   73,791
<ALLOWANCES>                                     1,870
<INVENTORY>                                      1,648
<CURRENT-ASSETS>                               270,616
<PP&E>                                         825,145
<DEPRECIATION>                                 124,079
<TOTAL-ASSETS>                               1,217,393
<CURRENT-LIABILITIES>                           46,603
<BONDS>                                        467,712
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           142
<OTHER-SE>                                     539,145
<TOTAL-LIABILITY-AND-EQUITY>                 1,217,393
<SALES>                                              0
<TOTAL-REVENUES>                                68,475
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                41,176
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               5,799
<INCOME-PRETAX>                                  8,931
<INCOME-TAX>                                     3,081
<INCOME-CONTINUING>                              5,850
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,217
<EPS-BASIC>                                     0.51
<EPS-DILUTED>                                     0.51