CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 221,683	$ 162,897
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangibles	39	36
Depreciation and other amortization	12,152	8,450
(Gain) loss on disposal of property and equipment	(93)	103
Stock-based compensation	12,722	12,835
Gain on put options	(3,671)	(3,785)
Loss on investments, net	259	4,649
Deferred income taxes		2,581
Tax benefit from exercise of stock options	(3,363)	(10,192)
Provision for doubtful accounts	49	1,344
Effect on cash of changes in operating assets and liabilities:
Accounts receivable	(39,197)	(27,929)
Distributor receivables	(99)	3,863
Inventories	(11,833)	(40,611)
Prepaid expenses and other current assets	713	(594)
Prepaid income taxes	9,706	(2,661)
Accounts payable	22,511	42,522
Accrued liabilities	8,387	14,943
Accrued distributor terminations	(393)	(424)
Accrued compensation	1,497	(755)
Income taxes payable	5,563	9,431
Deferred revenue	(3,629)	(5,888)
Net cash provided by operating activities	233,003	170,815
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of held-to-maturity investments	280,839	104,967
Sales of available-for-sale investments	22,658	9,200
Sales of trading investments	30,975	5,750
Purchases of held-to-maturity investments	(449,116)	(89,969)
Purchases of available-for-sale investments	(33,312)
Purchases of property and equipment	(19,926)	(7,967)
Proceeds from sale of property and equipment	349	59
Additions to intangibles	(4,190)	(8,754)
Decrease in other assets	1,061	162
Net cash (used in) provided by investing activities	(170,662)	13,448
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on debt	(1,178)	(308)
Tax benefit from exercise of stock options	3,363	10,192
Issuance of common stock	17,794	10,907
Purchases of common stock held in treasury	(149,043)	(23,540)
Net cash used in financing activities	(129,064)	(2,749)
Effect of exchange rate changes on cash and cash equivalents	(962)	(234)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(67,685)	181,280
CASH AND CASH EQUIVALENTS, beginning of period	354,842	328,349
CASH AND CASH EQUIVALENTS, end of period	287,157	509,629
Cash paid during the period for:
Interest	34	9
Income taxes	$ 115,701	$ 97,156