<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS FOR THE SIX MONTHS ENDED
JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.

<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                              15
<SECURITIES>                                         0
<RECEIVABLES>                                   22,803
<ALLOWANCES>                                         0
<INVENTORY>                                        211
<CURRENT-ASSETS>                                26,805
<PP&E>                                         437,726
<DEPRECIATION>                                 177,356
<TOTAL-ASSETS>                                 287,580
<CURRENT-LIABILITIES>                           52,843
<BONDS>                                         42,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           185
<OTHER-SE>                                     187,583
<TOTAL-LIABILITY-AND-EQUITY>                   287,580
<SALES>                                         47,278
<TOTAL-REVENUES>                                47,396
<CGS>                                            7,128
<TOTAL-COSTS>                                   29,849
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 344
<INCOME-PRETAX>                                 17,203
<INCOME-TAX>                                     4,504
<INCOME-CONTINUING>                             12,699
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    12,699
<EPS-BASIC>                                        .69
<EPS-DILUTED>                                      .68