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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> JUN-30-2000
<CASH> 4,866
<SECURITIES> 4,364
<RECEIVABLES> 48,778
<ALLOWANCES> 4,897
<INVENTORY> 21,198
<CURRENT-ASSETS> 84,418
<PP&E> 251,928
<DEPRECIATION> 163,363
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<CURRENT-LIABILITIES> 41,457
<BONDS> 918
0
0
<COMMON> 2,825
<OTHER-SE> 152,207
<TOTAL-LIABILITY-AND-EQUITY> 202,508
<SALES> 0
<TOTAL-REVENUES> 82,472
<CGS> 34,778
<TOTAL-COSTS> 69,901
<OTHER-EXPENSES> 4,670
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 8,342
<INCOME-TAX> 3,170
<INCOME-CONTINUING> 5,172
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<EXTRAORDINARY> 0
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<NET-INCOME> 5,172
<EPS-BASIC> 0.19
<EPS-DILUTED> 0.18
</TABLE>
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