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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 8,350
<SECURITIES> 6,724
<RECEIVABLES> 50,143
<ALLOWANCES> 4,982
<INVENTORY> 21,698
<CURRENT-ASSETS> 97,853
<PP&E> 255,431
<DEPRECIATION> (164,878)
<TOTAL-ASSETS> 215,159
<CURRENT-LIABILITIES> 47,124
<BONDS> 484
0
0
<COMMON> 2,826
<OTHER-SE> 162,269
<TOTAL-LIABILITY-AND-EQUITY> 215,159
<SALES> 0
<TOTAL-REVENUES> 86,196
<CGS> 30,604
<TOTAL-COSTS> 68,567
<OTHER-EXPENSES> 4,953
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 13,092
<INCOME-TAX> 4,975
<INCOME-CONTINUING> 8,117
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 8,117
<EPS-BASIC> .29
<EPS-DILUTED> .29
</TABLE>
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