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	$ 131,343	$ 112,788	$ 67,726
Depreciation and amortization	36,694	37,263	37,059
Unrealized (gain) loss on foreign exchange, net	13,928	(11,892)	1,334
Deferred income taxes	(2,981)	(819)	(4,999)
Charitable contributions	1,743	2,034	840
Non-cash restructuring charges			196
Provision for (recovery of) doubtful accounts, net	2,166	(383)	2,204
Share based compensation	11,321	8,550	7,109
Other non-cash items	1,392	339	1,083
Accounts receivable	(9,475)	(23,278)	(13,165)
Inventories	(35,493)	(13,328)	(27,908)
Prepaid expenses and other assets	(25,490)	(17,598)	2,230
Accounts payable	99	30,314	12,689
Accrued expenses and other liabilities	8,016	19,922	20,344
Accrued restructuring		(439)	(2,696)
Income taxes	(4,907)	(1,097)	228
Cash provided by operating activities	128,356	142,376	104,274
Cash flows from investing activities:
Purchases of marketable securities			(5,654)
Sales of marketable securities			7,369
Cash paid for purchases of property and equipment	(39,762)	(27,718)	(31,257)
Proceeds from disposal of property and equipment	2,216	319	1,274
Cash paid for intangible assets	(21,074)	(13,922)	(13,848)
Business acquisitions, net of cash	(5,169)
Restricted cash	(2,154)	(343)	38
Cash (used in) investing activities	(65,943)	(41,664)	(42,078)
Cash flows from financing activities:
Proceeds from bank borrowings	96,086	316,595	83,100
Repayment of bank borrowings and capital lease obligations	(90,625)	(317,704)	(84,625)
Deferred debt issuance costs	(225)	(398)
Issuances of common stock	3,706	10,914	7,191
Cash for purchase of treasury stock	(25,074)
Repurchase of common stock for tax withholding	(493)	(490)	(421)
Cash provided by financing activities	(16,625)	8,917	5,245
Effect of exchange rate changes on cash	(9,027)	2,375	799
Net increase in cash and cash equivalents	36,761	112,004	68,240
Cash and cash equivalents - beginning of year	257,587	145,583	77,343
Cash and cash equivalents - end of year	294,348	257,587	145,583
Supplemental disclosure of cash flow information-cash paid during the period for:
Interest	619	843	639
Income taxes	29,385	26,632	11,048
Supplemental disclosure of non-cash, investing, and financing activities:
Assets acquired under capitalized leases	34		2,606
Accrued purchases of property and equipment	2,368	4,022	1,826
Accrued purchases of intangibles	$ 768	$ 223	$ 3,786