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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 338,661 $ 340,020 $ 286,219
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of trademark 49 49 52
Depreciation and amortization 22,713 20,513 17,032
Loss (gain) on disposal of property and equipment 506 25 (18)
Stock-based compensation 28,764 28,413 19,424
Loss on put option 838 1,111 727
(Gain) loss on investments, net (3,553) (1,897) 43
Deferred income taxes (7,074) (2,460) (687)
Tax benefit from exercise of stock options (30,348) (19,656) (3,824)
Provision for doubtful accounts 125 (10) 52
Effect on cash of changes in operating assets and liabilities:      
Accounts receivable (43,026) (17,772) (56,752)
Distributor receivables (7,382) 3 (256)
Inventories (21,552) (47,568) (4,465)
Prepaid expenses and other current assets (4,501) (4,523) (6,209)
Prepaid income taxes 24,008 (33,210) 9,470
Accounts payable (8,204) 3,659 26,250
Accrued liabilities 2,265 6,458 8,144
Accrued promotional allowances 8,932 2,723 28,442
Accrued distributor terminations 1,552 794 (330)
Accrued compensation 1,970 2,498 2,878
Income taxes payable 34,308 14,165 13,918
Deferred revenue 2,982 (5,659) (6,283)
Net cash provided by operating activities 342,033 287,676 333,827
CASH FLOWS FROM INVESTING ACTIVITIES:      
Maturities of held-to-maturity investments 256,843 841,576 407,918
Sales of available-for-sale investments 5,793 68,451 30,545
Sales of trading investments 2,250 17,050 34,715
Purchases of held-to-maturity investments (557,419) (597,155) (583,138)
Purchases of available-for-sale investments   (9,502) (33,312)
Purchases of property and equipment (40,762) (42,935) (25,552)
Proceeds from sale of property and equipment 9,022 288 519
Additions to intangibles (11,175) (6,301) (5,132)
(Increase) decrease in other assets (4,360) 377 410
Net cash (used in) provided by investing activities (339,808) 271,849 (173,027)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Principal payments on debt (1,887) (2,076) (1,942)
Tax benefit from exercise of stock options 30,348 19,656 3,824
Issuance of common stock 21,252 11,015 20,318
Purchases of common stock held in treasury (67,599) (727,670) (176,392)
Net cash used in financing activities (17,886) (699,075) (154,192)
Effect of exchange rate changes on cash and cash equivalents 4,496 2,733 (2,119)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (11,165) (136,817) 4,489
CASH AND CASH EQUIVALENTS, beginning of year 222,514 359,331 354,842
CASH AND CASH EQUIVALENTS, end of year 211,349 222,514 359,331
Cash paid during the year for:      
Interest 49 48 48
Income taxes $ 174,278 $ 230,221 $ 147,927