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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 76,099 $ 55,043
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of trademark 12 12
Depreciation and other amortization 4,956 3,581
Gain on disposal of property and equipment (39) (74)
Stock-based compensation 6,571 3,779
Loss (gain) on put option 1,391 (20)
Gain on investments, net (1,787) (278)
Deferred income taxes 2,574  
Tax benefit from exercise of stock options (492) (190)
Effect on cash of changes in operating assets and liabilities:    
Accounts receivable (33,867) (51,722)
Distributor receivables (43) 397
Inventories (34,128) (19,548)
Prepaid expenses and other current assets 257 (4,015)
Prepaid income taxes (1,216) 9,802
Accounts payable 16,201 21,418
Accrued liabilities 14,058 6,278
Accrued promotional allowances (34,034) (17,844)
Accrued distributor terminations (76) (393)
Accrued compensation (3,836) (2,417)
Income taxes payable 25,784 20,921
Deferred revenue (1,615) (1,117)
Net cash provided by operating activities 36,770 23,613
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments 141,806 41,950
Sales of available-for-sale investments 29,891 4,551
Sales of trading investments 15,750 1,000
Purchases of held-to-maturity investments (190,635) (80,894)
Purchases of available-for-sale investments (2,001) (6,774)
Purchases of property and equipment (14,542) (6,523)
Proceeds from sale of property and equipment 164 207
Additions to intangibles (749) (1,996)
Decrease (increase) in other assets 302 (26)
Net cash used in investing activities (20,014) (48,505)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (610) (249)
Tax benefit from exercise of stock options 492 190
Issuance of common stock 2,722 4,247
Purchases of common stock held in treasury   (38,862)
Net cash provided by (used in) financing activities 2,604 (34,674)
Effect of exchange rate changes on cash and cash equivalents 12,747 229
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 32,107 (59,337)
CASH AND CASH EQUIVALENTS, beginning of period 359,331 354,842
CASH AND CASH EQUIVALENTS, end of period 391,438 295,505
Cash paid during the period for:    
Interest 14 10
Income taxes $ 23,491 $ 2,870