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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 221,645 $ 153,330 $ 136,051
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 33,412 32,850 29,616
Japan customs expense 0 32,754 0
Foreign currency (gains)/losses (3,874) 4,162 3,681
Stock-based compensation 21,358 15,450 10,835
Deferred taxes 4,692 108 (13,735)
Changes in operating assets and liabilities:      
Accounts receivable (7,884) (5,890) (6,649)
Inventories, net (22,605) 2,415 (4,293)
Prepaid expenses and other (2,358) (4,690) 3,854
Other assets (11,579) (16,809) (1,631)
Accounts payable 15,831 6,077 (568)
Accrued expenses 62,056 1,624 13,777
Other liabilities 282 2,934 16,945
Net cash provided by operating activities 310,976 224,315 187,883
Cash flows from investing activities:      
Purchase of property and equipment (96,645) (41,809) (53,783)
Proceeds on investment sales 20,086 6,634 0
Purchases of investments (15,737) (24,361) 0
Acquisitions (Note 24)) (12,562) (11,663) 0
Net cash used in investing activities (104,858) (71,199) (53,783)
Cash flows from financing activities:      
Payment of cash dividends (48,374) (36,638) (31,189)
Repurchase of shares of common stock (201,471) (67,149) (58,516)
Exercise of distributor and employee stock options 4,565 29,713 21,181
Income tax benefit of options exercised 7,750 12,059 6,908
Payments on long-term debt (28,279) (28,001) (37,401)
Related party payment 0 (16,995) 0
Proceeds from long-term debt 101,922 0 30,000
Net cash used in financing activities (163,887) (107,011) (69,017)
Effect of exchange rate changes on cash 4,820 (3,468) 7,209
Net increase in cash and cash equivalents 47,051 42,637 72,292
Cash and cash equivalents, beginning of period 272,974 230,337 158,045
Cash and cash equivalents, end of period $ 320,025 $ 272,974 $ 230,337