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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 272,037 $ 221,683
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of trademark 36 39
Depreciation and other amortization 15,228 12,152
Gain on disposal of property and equipment (52) (93)
Stock-based compensation 21,581 12,722
Loss (gain) on put option 1,110 (3,671)
(Gain) loss on investments, net (1,695) 259
Deferred income taxes 2,571  
Tax benefit from exercise of stock options (4,295) (3,363)
Effect on cash of changes in operating assets and liabilities:    
Accounts receivable (70,533) (69,630)
Distributor receivables   (99)
Inventories (38,646) (11,833)
Prepaid expenses and other current assets 136 713
Prepaid income taxes (17,974) 9,706
Accounts payable 27,814 55,306
Accrued liabilities 26,652 12,269
Accrued promotional allowances (9,306) (6,195)
Accrued distributor terminations (77) (393)
Accrued compensation 1,463 1,497
Income taxes payable (3,831) 5,563
Deferred revenue (4,170) (3,629)
Net cash provided by operating activities 218,049 233,003
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments 596,587 280,839
Sales of available-for-sale investments 61,950 22,658
Sales of trading investments 16,765 30,975
Purchases of held-to-maturity investments (557,168) (449,116)
Purchases of available-for-sale investments (9,502) (33,312)
Purchases of property and equipment (25,813) (19,926)
Proceeds from sale of property and equipment 238 349
Additions to intangibles (4,490) (4,190)
Decrease in other assets 385 1,061
Net cash provided by (used in) investing activities 78,952 (170,662)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (1,622) (1,178)
Tax benefit from exercise of stock options 4,295 3,363
Issuance of common stock 8,368 17,794
Purchases of common stock held in treasury (386,776) (149,043)
Net cash used in financing activities (375,735) (129,064)
Effect of exchange rate changes on cash and cash equivalents 2,457 (962)
NET DECREASE IN CASH AND CASH EQUIVALENTS (76,277) (67,685)
CASH AND CASH EQUIVALENTS, beginning of period 359,331 354,842
CASH AND CASH EQUIVALENTS, end of period 283,054 287,157
Cash paid during the period for:    
Interest 40 34
Income taxes $ 184,451 $ 115,701