<ARTICLE>                     5
       
                                                                      
<PERIOD-TYPE>                    12-MOS                  12-MOS                12-MOS
<FISCAL-YEAR-END>               DEC-31-1996              DEC-31-1997           DEC-31-1998
<PERIOD-START>                  JAN-01-1996              JAN-01-1997           JAN-01-1998
<PERIOD-END>                    DEC-31-1996              DEC-31-1997           DEC-31-1998
<CASH>                            2,079,681                1,175,557            3,665,073
<SECURITIES>                              0                        0                    0
<RECEIVABLES>                    10,878,489               14,797,371           17,534,206
<ALLOWANCES>                        616,000                  907,800              699,600
<INVENTORY>                       1,974,114                  842,439            1,334,409
<CURRENT-ASSETS>                 14,783,067               17,121,152           23,916,843
<PP&E>                           43,233,148               65,043,853           88,801,179
<DEPRECIATION>                    9,307,168               11,796,807           16,980,855
<TOTAL-ASSETS>                   62,673,071              113,417,495          176,201,168
<CURRENT-LIABILITIES>            13,252,193               15,486,056           16,973,769
<BONDS>                          34,380,184               50,787,684           86,464,655
<PREFERRED-MANDATORY>                     0                        0                    0
<PREFERRED>                               0                        0                    0
<COMMON>                          2,686,637               27,119,623           41,148,148
<OTHER-SE>                       11,974,037               14,047,132           23,514,645
<TOTAL-LIABILITY-AND-EQUITY>     62,673,071              113,417,495          176,201,168
<SALES>                         106,277,778              129,181,969          171,258,483
<TOTAL-REVENUES>                106,277,778              129,181,969          171,258,483
<CGS>                            66,580,976               79,486,561          104,790,864
<TOTAL-COSTS>                    96,078,636              115,847,703          151,193,615
<OTHER-EXPENSES>                          0                        0                    0
<LOSS-PROVISION>                          0                        0                    0
<INTEREST-EXPENSE>                2,497,484                3,021,496            4,811,957
<INCOME-PRETAX>                   8,507,702               10,946,787           15,884,377
<INCOME-TAX>                              0                7,011,250            5,606,500
<INCOME-CONTINUING>               8,507,702                3,935,537           10,277,877
<DISCONTINUED>                            0                        0                    0
<EXTRAORDINARY>                           0                        0                    0
<CHANGES>                                 0                        0                    0
<NET-INCOME>                      8,507,702                3,935,537           10,277,877
<EPS-PRIMARY>                          0.48                     0.58                 0.78
<EPS-DILUTED>                          0.47                     0.56                 0.76