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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> Dec-31-1999
<PERIOD-END> Mar-31-2000
<CASH> 84,913
<SECURITIES> 41,755
<RECEIVABLES> 76,166
<ALLOWANCES> 0
<INVENTORY> 2,605
<CURRENT-ASSETS> 214,580
<PP&E> 131,961
<DEPRECIATION> (92,462)
<TOTAL-ASSETS> 263,441
<CURRENT-LIABILITIES> 87,001
<BONDS> 0
0
0
<COMMON> 149,873
<OTHER-SE> 20,012
<TOTAL-LIABILITY-AND-EQUITY> 263,441
<SALES> 53,320
<TOTAL-REVENUES> 92,802
<CGS> 7,180
<TOTAL-COSTS> 30,285
<OTHER-EXPENSES> 55,084
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 8,625
<INCOME-TAX> 2,156
<INCOME-CONTINUING> 6,469
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 6,469
<EPS-BASIC> .19
<EPS-DILUTED> .18
</TABLE>
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