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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 357,854 $ 262,555
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 19,124 16,444
Gain on disposal of property and equipment (379) (53)
Stock-based compensation 22,509 21,592
Loss on put option 771 411
Gain on investments, net (732) (3,091)
Deferred income taxes (7,919) (926)
Tax benefit from exercise of stock options (11,541) (30,250)
Effect on cash of changes in operating assets and liabilities:    
Accounts receivable (45,759) (104,666)
Distributor receivables 2,047 (3,384)
Inventories 13,300 (46,687)
Prepaid expenses and other current assets (4,564) (13,026)
Prepaid income taxes (8,723) (4,906)
Accounts payable 30,032 33,731
Accrued liabilities 12,387 21,157
Accrued promotional allowances 32,421 40,175
Accrued distributor terminations (2,338) 3,524
Accrued compensation (467) (51)
Income taxes payable 4,909 78,447
Deferred revenue (5,883) 4,838
Net cash provided by operating activities 407,049 275,834
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments 545,774 179,575
Sales of available-for-sale investments   5,775
Sales of trading investments 12,075 1,250
Purchases of held-to-maturity investments (761,538) (392,870)
Purchases of property and equipment (19,300) (32,612)
Proceeds from sale of property and equipment 745 8,762
Increase in intangibles (1,765) (9,001)
Decrease (increase) in other assets 1,027 (7,576)
Net cash used in investing activities (222,982) (246,697)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (1,316) (1,322)
Tax benefit from exercise of stock options 11,541 30,250
Issuance of common stock 15,050 18,198
Purchases of common stock held in treasury (8,126) (13,401)
Net cash provided by financing activities 17,149 33,725
Effect of exchange rate changes on cash and cash equivalents (4,242) 1,643
NET INCREASE IN CASH AND CASH EQUIVALENTS 196,974 64,505
CASH AND CASH EQUIVALENTS, beginning of period 211,349 222,514
CASH AND CASH EQUIVALENTS, end of period 408,323 287,019
Cash paid during the period for:    
Interest 27 36
Income taxes $ 210,090 $ 97,171