WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                              Dec. 31
<PERIOD-END>                                  Sept. 30
<CASH>                                           4,475
<SECURITIES>                                   104,463
<RECEIVABLES>                                   10,775
<ALLOWANCES>                                         0
<INVENTORY>                                        238
<CURRENT-ASSETS>                                12,753
<PP&E>                                         167,428
<DEPRECIATION>                                  54,262
<TOTAL-ASSETS>                                 235,113
<CURRENT-LIABILITIES>                            9,287
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        27,817
<OTHER-SE>                                     132,812
<TOTAL-LIABILITY-AND-EQUITY>                   235,113
<SALES>                                         15,086
<TOTAL-REVENUES>                                24,190
<CGS>                                            2,329
<TOTAL-COSTS>                                    2,329
<OTHER-EXPENSES>                                12,539
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,094
<INCOME-PRETAX>                                 11,592
<INCOME-TAX>                                     2,102
<INCOME-CONTINUING>                              9,490
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,490
<EPS-PRIMARY>                                     2.20
<EPS-DILUTED>                                     2.20