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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 95,250 $ 63,496
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,453 5,060
Gain on disposal of property and equipment (100) (2)
Stock-based compensation 6,986 6,959
Loss (gain) on put option 67 (83)
Gain on investments, net (66) (2,489)
Deferred income taxes 168 (398)
Tax benefit from exercise of stock options (2,602) (176)
Effect on cash of changes in operating assets and liabilities:    
Accounts receivable (42,544) (69,713)
Distributor receivables 947 (8,314)
Inventories 17,410 (14,080)
Prepaid expenses and other current assets (7,110) (10,584)
Prepaid income taxes 4,417 27,417
Accounts payable 6,068 7,479
Accrued liabilities 4,610 9,879
Accrued promotional allowances 14,708 13,939
Accrued distributor terminations   7,372
Accrued compensation (5,838) (5,377)
Income taxes payable 39,095 9,270
Deferred revenue (1,517) 6,238
Net cash provided by operating activities 136,402 45,893
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments 151,035 66,344
Sales of trading investments 1,725  
Purchases of held-to-maturity investments (187,718) (69,464)
Purchases of property and equipment (9,871) (8,732)
Proceeds from sale of property and equipment 237 18
Decrease (increase) in intangibles 105 (3,362)
Decrease (increase) in other assets 543 (219)
Net cash used in investing activities (43,944) (15,415)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (620) (296)
Tax benefit from exercise of stock options 2,602 176
Issuance of common stock 5,728 2,381
Purchases of common stock held in treasury (20) (13,361)
Net cash provided by (used in) financing activities 7,690 (11,100)
Effect of exchange rate changes on cash and cash equivalents 523 641
NET INCREASE IN CASH AND CASH EQUIVALENTS 100,671 20,019
CASH AND CASH EQUIVALENTS, beginning of period 211,349 222,514
CASH AND CASH EQUIVALENTS, end of period 312,020 242,533
Cash paid during the period for:    
Interest 12 5
Income taxes $ 9,747 $ 5,663