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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> Dec-31-1999
<PERIOD-END> Jun-30-2000
<CASH> 83,267
<SECURITIES> 39,133
<RECEIVABLES> 70,004
<ALLOWANCES> 0
<INVENTORY> 3,069
<CURRENT-ASSETS> 206,488
<PP&E> 140,007
<DEPRECIATION> (96,232)
<TOTAL-ASSETS> 273,252
<CURRENT-LIABILITIES> 87,528
<BONDS> 0
0
0
<COMMON> 152,935
<OTHER-SE> 26,883
<TOTAL-LIABILITY-AND-EQUITY> 273,252
<SALES> 107,713
<TOTAL-REVENUES> 187,881
<CGS> 14,990
<TOTAL-COSTS> 61,171
<OTHER-EXPENSES> 111,603
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 17,627
<INCOME-TAX> 4,136
<INCOME-CONTINUING> 13,491
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 13,491
<EPS-BASIC> .40
<EPS-DILUTED> .37
</TABLE>
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