<ARTICLE> 5

                                                  
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998
<PERIOD-END>                               DEC-31-1999             DEC-31-1998
<CASH>                                       1,438,992               2,807,887
<SECURITIES>                                   122,786                 116,681
<RECEIVABLES>                               18,380,274              14,899,115
<ALLOWANCES>                                   107,500                 107,500
<INVENTORY>                                  2,551,724               2,331,957
<CURRENT-ASSETS>                            24,008,306              22,683,227
<PP&E>                                     219,689,824             194,501,417
<DEPRECIATION>                             105,514,615              94,329,834
<TOTAL-ASSETS>                             257,695,210             183,634,358
<CURRENT-LIABILITIES>                       15,873,701              16,695,089
<BONDS>                                     20,000,000              20,000,000
<PREFERRED-MANDATORY>                          112,500                 125,000
<PREFERRED>                                    397,000                 406,800
<COMMON>                                    38,584,516              35,748,327
<OTHER-SE>                                 136,184,586              83,428,061
<TOTAL-LIABILITY-AND-EQUITY>               257,695,210             183,634,358
<SALES>                                              0                       0
<TOTAL-REVENUES>                           105,591,594              91,725,394
<CGS>                                                0                       0
<TOTAL-COSTS>                               83,223,191              70,272,414
<OTHER-EXPENSES>                            16,397,523                 855,899
<LOSS-PROVISION>                               603,458                 433,747
<INTEREST-EXPENSE>                           2,575,048               1,491,635
<INCOME-PRETAX>                             38,765,926              22,308,879
<INCOME-TAX>                                15,697,657               8,926,469
<INCOME-CONTINUING>                         23,068,259              13,382,410
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                23,068,269              13,382,410
<EPS-BASIC>                                       2.46                    1.45
<EPS-DILUTED>                                     2.44                    1.44