<ARTICLE> 5
<RESTATED>
       
                                                                                                
<PERIOD-TYPE>                              3-MOS                          6-MOS                          9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997                    DEC-31-1997                    DEC-31-1997
<PERIOD-END>                               MAR-31-1997                    JUN-30-1997                    SEP-30-1997
<CASH>                                       2,182,051                         37,523                         38,686
<SECURITIES>                                         0                              0                              0
<RECEIVABLES>                               14,725,438                     16,858,934                     17,518,777
<ALLOWANCES>                                         0                              0                              0
<INVENTORY>                                    721,092                        670,703                        800,792
<CURRENT-ASSETS>                            25,430,484                     23,813,436                     27,325,891
<PP&E>                                     116,011,088                    125,518,188                    140,721,351
<DEPRECIATION>                              31,925,371                     35,026,305                     36,302,124
<TOTAL-ASSETS>                             112,366,761                    116,931,629                    134,128,220
<CURRENT-LIABILITIES>                       32,690,298                     34,120,540                     36,121,377
<BONDS>                                     22,065,057                     22,759,362                     33,775,389
<PREFERRED-MANDATORY>                                0                              0                              0
<PREFERRED>                                          0                              0                              0
<COMMON>                                        66,081                         65,731                         65,871
<OTHER-SE>                                  43,767,325                     45,377,996                     47,837,583
<TOTAL-LIABILITY-AND-EQUITY>               112,366,761                    116,931,629                    134,128,220
<SALES>                                              0                              0                              0
<TOTAL-REVENUES>                            43,475,225                     89,843,804                    136,943,734
<CGS>                                                0                              0                              0
<TOTAL-COSTS>                               41,188,165                     83,357,540                    125,667,322
<OTHER-EXPENSES>                                     0                              0                              0
<LOSS-PROVISION>                                     0                              0                              0
<INTEREST-EXPENSE>                             663,956                      1,419,600                      2,227,445
<INCOME-PRETAX>                              1,674,888                      5,124,967                      9,107,465
<INCOME-TAX>                                   687,000                      2,063,000                      3,656,000
<INCOME-CONTINUING>                            987,888                      3,061,967                      5,451,465
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<NET-INCOME>                                   987,888                      3,061,967                      5,451,465
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<EPS-DILUTED>                                     0.15                           0.45                           0.81