<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-2000 <PERIOD-START> JAN-01-2000 <PERIOD-END> JUN-01-2000 <EXCHANGE-RATE> 1 <CASH> 2,867 <SECURITIES> 0 <RECEIVABLES> 46,771 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 51,753 <PP&E> 357,055 <DEPRECIATION> 161,001 <TOTAL-ASSETS> 257,314 <CURRENT-LIABILITIES> 21,004 <BONDS> 13,850 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 141 <OTHER-SE> 213,818 <TOTAL-LIABILITY-AND-EQUITY> 257,314 <SALES> 80,008 <TOTAL-REVENUES> 83,409 <CGS> 16,224 <TOTAL-COSTS> 16,224 <OTHER-EXPENSES> 1,234 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 123 <INCOME-PRETAX> 36,316 <INCOME-TAX> 13,833 <INCOME-CONTINUING> 22,483 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 22,483 <EPS-BASIC> 1.63 <EPS-DILUTED> 1.61