CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 262,555	$ 272,037
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of trademark	36	36
Depreciation and other amortization	16,408	15,228
Gain on disposal of property and equipment	(53)	(52)
Stock-based compensation	21,592	21,581
Loss on put option	411	1,110
Gain on investments, net	(3,091)	(1,695)
Deferred income taxes	(926)	2,571
Tax benefit from exercise of stock options	(30,250)	(4,295)
Effect on cash of changes in operating assets and liabilities:
Accounts receivable	(104,666)	(70,533)
Distributor receivables	(3,384)
Inventories	(46,687)	(38,646)
Prepaid expenses and other current assets	(13,026)	136
Prepaid income taxes	(4,906)	(17,974)
Accounts payable	33,731	27,814
Accrued liabilities	21,157	26,652
Accrued promotional allowances	40,175	(9,306)
Accrued distributor terminations	3,524	(77)
Accrued compensation	(51)	1,463
Income taxes payable	78,447	(3,831)
Deferred revenue	4,838	(4,170)
Net cash provided by operating activities	275,834	218,049
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of held-to-maturity investments	179,575	596,587
Sales of available-for-sale investments	5,775	61,950
Sales of trading investments	1,250	16,765
Purchases of held-to-maturity investments	(392,870)	(557,168)
Purchases of available-for-sale investments		(9,502)
Purchases of property and equipment	(32,612)	(25,813)
Proceeds from sale of property and equipment	8,762	238
Additions to intangibles	(9,001)	(4,490)
(Increase) decrease in other assets	(7,576)	385
Net cash (used in) provided by investing activities	(246,697)	78,952
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on debt	(1,322)	(1,622)
Tax benefit from exercise of stock options	30,250	4,295
Issuance of common stock	18,198	8,368
Purchases of common stock held in treasury	(13,401)	(386,776)
Net cash provided by (used in) financing activities	33,725	(375,735)
Effect of exchange rate changes on cash and cash equivalents	1,643	2,457
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	64,505	(76,277)
CASH AND CASH EQUIVALENTS, beginning of period	222,514	359,331
CASH AND CASH EQUIVALENTS, end of period	287,019	283,054
Cash paid during the period for:
Interest	36	40
Income taxes	$ 97,171	$ 184,451