Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 128,717	$ 108,236
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,527	16,938
Foreign currency gains	863	(938)
Stock-based compensation	11,411	11,131
Deferred taxes	(2,901)	3,508
Changes in operating assets and liabilities:
Accounts receivable	(24,647)	(13,447)
Inventories, net	(45,228)	(12,912)
Prepaid expenses and other	(25,515)	(7,441)
Other assets	(10,987)	(12,479)
Accounts payable	3,593	12,152
Accrued expenses	132,787	56,860
Other liabilities	5,237	6,746
Net cash provided by operating activities	188,857	168,354
Cash flows from investing activities:
Purchases of property and equipment	(82,515)	(30,142)
Proceeds of investment sales	9,701	13,944
Purchases of investments	(5,077)	(9,855)
Net cash used in investing activities	(77,891)	(26,053)
Cash flows from financing activities:
Payment of cash dividends	(35,140)	(24,741)
Repurchases of shares of common stock	(14,615)	(113,314)
Exercise of employee stock options	7,359	1,951
Income tax benefit of options exercised	7,309	6,316
Payment of debt	(13,890)	(15,398)
Proceeds from debt	35,000	100,006
Net cash used in financing activities	(13,977)	(45,180)
Effect of exchange rate changes on cash	(14,336)	1,706
Net increase in cash and cash equivalents	82,653	98,827
Cash and cash equivalents, beginning of period	320,025	272,974
Cash and cash equivalents, end of period	$ 402,678	$ 371,801