<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S REPORT ON FORM 10-Q FOR THE NINE-MONTH PERIOD ENDED SEPTEMBER 30,
1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                       1,340,261
<SECURITIES>                                         0 
<RECEIVABLES>                               14,593,592
<ALLOWANCES>                                   134,999
<INVENTORY>                                    262,292
<CURRENT-ASSETS>                            20,558,347
<PP&E>                                     127,113,115
<DEPRECIATION>                              33,987,217
<TOTAL-ASSETS>                             116,728,352
<CURRENT-LIABILITIES>                       20,890,234
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        94,212
<OTHER-SE>                                  60,473,568
<TOTAL-LIABILITY-AND-EQUITY>               116,728,352
<SALES>                                    108,877,380
<TOTAL-REVENUES>                           108,877,380
<CGS>                                                0
<TOTAL-COSTS>                               94,415,939
<OTHER-EXPENSES>                             1,437,215
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           1,387,552
<INCOME-PRETAX>                             13,024,226
<INCOME-TAX>                                 5,066,424
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 7,957,802
<EPS-PRIMARY>                                     0.85
<EPS-DILUTED>                                     0.84