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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> Dec-31-1999
<PERIOD-END> Sep-30-2000
<CASH> 89,765
<SECURITIES> 39,098
<RECEIVABLES> 74,909
<ALLOWANCES> 0
<INVENTORY> 2,975
<CURRENT-ASSETS> 217,342
<PP&E> 144,852
<DEPRECIATION> (99,360)
<TOTAL-ASSETS> 285,400
<CURRENT-LIABILITIES> 90,795
<BONDS> 0
0
0
<COMMON> 155,345
<OTHER-SE> 33,103
<TOTAL-LIABILITY-AND-EQUITY> 285,400
<SALES> 163,305
<TOTAL-REVENUES> 287,026
<CGS> 21,168
<TOTAL-COSTS> 93,278
<OTHER-EXPENSES> 166,882
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 30,714
<INCOME-TAX> 7,015
<INCOME-CONTINUING> 23,699
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 23,699
<EPS-BASIC> .70
<EPS-DILUTED> .65
</TABLE>
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