<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEET CONSOLIDATED STATEMENT OF OPERATIONS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000
<PERIOD-START> APR-01-2000 JAN-01-2000
<PERIOD-END> JUN-30-2000 JUN-30-2000
<CASH> 1,531 1,531
<SECURITIES> 0 0
<RECEIVABLES> 36,171 36,171
<ALLOWANCES> 0 0
<INVENTORY> 15,600 15,600
<CURRENT-ASSETS> 57,977 57,977
<PP&E> 602,974 602,974
<DEPRECIATION> (84,037) (84,037)
<TOTAL-ASSETS> 581,889 581,889
<CURRENT-LIABILITIES> 56,576 56,576
<BONDS> 0 0
0 0
0 0
<COMMON> 385 385
<OTHER-SE> 364,325 364,325
<TOTAL-LIABILITY-AND-EQUITY> 581,889 581,889
<SALES> 48,565 109,900
<TOTAL-REVENUES> 48,565 109,900
<CGS> 29,586 60,780
<TOTAL-COSTS> 31,829 65,078
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 185 464
<INCOME-PRETAX> 16,921 45,286
<INCOME-TAX> (4,738) (12,680)
<INCOME-CONTINUING> 12,183 32,606
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 12,183 32,606
<EPS-BASIC> 0.32 0.85
<EPS-DILUTED> 0.31 0.83
</TABLE>