<ARTICLE>  5
   <LEGEND>
   THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
   FROM THE BALANCE SHEET AS OF JUNE 30,1999, AND
   THE RELATED STATEMENTS OF INCOME FOR THE THREE MONTHS AND SIX
   MONTHS ENDED JUNE 30,1999, AND THE NOTES RELATED THERETO AND
   IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
   STATEMENTS.
   </LEGEND>

                                           
   <PERIOD-TYPE>                              3-MOS
   <FISCAL-YEAR-END>                          DEC-31-1999
   <PERIOD-START>                             APR-01-1999
   <PERIOD-END>                               JUN-30-1999
   <CASH>                                         612,693
   <SECURITIES>                                         0
   <RECEIVABLES>                               66,738,514
   <ALLOWANCES>                                 2,428,632
   <INVENTORY>                                          0
   <CURRENT-ASSETS>                            84,740,892
   <PP&E>                                     561,786,633
   <DEPRECIATION>                             143,669,104
   <TOTAL-ASSETS>                             515,831,057
   <CURRENT-LIABILITIES>                       79,653,730
   <BONDS>                                    160,129,716
   <COMMON>                                       122,876
   <PREFERRED-MANDATORY>                                0
   <PREFERRED>                                          0
   <OTHER-SE>                                 218,214,631
   <TOTAL-LIABILITY-AND-EQUITY>               515,831,057
   <SALES>                                              0
   <TOTAL-REVENUES>                           153,596,736
   <CGS>                                                0
   <TOTAL-COSTS>                              138,934,555
   <OTHER-EXPENSES>                                     0
   <LOSS-PROVISION>                                     0
   <INTEREST-EXPENSE>                           2,936,302
   <INCOME-PRETAX>                             12,974,545
   <INCOME-TAX>                                 4,605,963
   <INCOME-CONTINUING>                          8,368,582
   <DISCONTINUED>                                       0
   <EXTRAORDINARY>                                      0
   <CHANGES>                                            0
   <NET-INCOME>                                 8,368,582
   <EPS-BASIC>                                      .68
   <EPS-DILUTED>                                      .65