<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-2000 <PERIOD-START> JAN-01-2000 <PERIOD-END> SEP-30-2000 <EXCHANGE-RATE> 1 <CASH> 6,571 <SECURITIES> 0 <RECEIVABLES> 53,185 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 64,208 <PP&E> 377,875 <DEPRECIATION> 169,994 <TOTAL-ASSETS> 281,683 <CURRENT-LIABILITIES> 23,560 <BONDS> 3,000 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 284 <OTHER-SE> 232,310 <TOTAL-LIABILITY-AND-EQUITY> 281,683 <SALES> 133,604 <TOTAL-REVENUES> 137,253 <CGS> 26,061 <TOTAL-COSTS> 73,054 <OTHER-EXPENSES> 1,178 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 148 <INCOME-PRETAX> 64,706 <INCOME-TAX> 25,084 <INCOME-CONTINUING> 39,622 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 39,622 <EPS-BASIC> 1.43 <EPS-DILUTED> 1.41