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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<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
0
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
</TABLE>
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