Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 54,282	$ 47,829
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,612	8,504
Foreign currency gains	(336)	(3,798)
Stock-based compensation	5,712	4,277
Deferred taxes	2,826	1,414
Changes in operating assets and liabilities:
Accounts receivable	(8,048)	(6,522)
Inventories, net	(15,995)	(8,362)
Prepaid expenses and other	(9,997)	(5,467)
Other assets	(7,553)	(8,604)
Accounts payable	5,528	9,677
Accrued expenses	32,920	(11,704)
Other liabilities	3,435	4,318
Net cash provided by operating activities	70,386	31,562
Cash flows from investing activities:
Purchase of property and equipment	(41,239)	(14,627)
Proceeds on investment sales	4,844	11,350
Purchases of investments	0	(7,318)
Net cash used in investing activities	(36,395)	(10,595)
Cash flows from financing activities:
Payment of cash dividends	(17,514)	(12,458)
Repurchase of shares of common stock	(14,615)	(5,430)
Exercise of distributor and employee stock options	(268)	234
Income tax benefit of options exercised	2,245	4,735
Payments on long-term debt	(7,816)	(8,382)
Proceeds from long-term debt	20,000	0
Net cash used in financing activities	(17,968)	(21,301)
Effect of exchange rate changes on cash	(10,328)	3,566
Net increase in cash and cash equivalents	5,695	3,232
Cash and cash equivalents, beginning of period	320,025	272,974
Cash and cash equivalents, end of period	$ 325,720	$ 276,206