Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 51,959	$ 79,758	$ 53,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,484	39,830	39,807
Deferred income taxes	(17,991)	280	(1,073)
Asset impairments	46,530	237	236
Insurance recovery	(56,152)
Loss on liquidation of subsidiary		315
Gain on the sale of property, plant and equipment	(190)	(69)	(9)
Stock-based compensation expense	5,097	5,415	5,356
Excess tax shortfall (benefits) from stock-based compensation	14	(1,176)
Changes in operating assets and liabilities, net of effects from business acquisition:
Accounts receivable	27,703	(40,190)	6,346
Inventories	(72,666)	(48,008)	37,029
Prepaid expenses and other assets	12,087	(18,480)	(222)
Accounts payable	28,391	(16,675)	(14,922)
Accrued liabilities	2,655	5,356	3,744
Income taxes	(8,137)	(1,427)	(6,103)
Net cash provided by operations	54,784	5,166	123,570
Cash flows from investing activities:
Proceeds from sales and redemptions of investments	11,150	10,925	3,400
Additions to property, plant and equipment	(71,396)	(35,778)	(22,291)
Proceeds from the sale of property, plant and equipment	369	257	315
Additions to purchased software	(601)	(261)	(105)
Purchase of intangible asset			(11,300)
Business acquisition			(10,552)
Net cash used in investing activities	(60,478)	(24,857)	(40,533)
Cash flows from financing activities:
Proceeds from stock options exercised	2,571	3,252	3,602
Excess tax (shortfall) benefits from stock-based compensation	(14)	1,176
Principal payments on capital lease obligations	(363)	(300)	(254)
Share repurchases	(56,281)	(58,855)	(27,919)
Proceeds from exercise of warrants			203
Net cash used in financing activities	(54,087)	(54,727)	(24,368)
Effect of exchange rate changes	(2,644)	(480)	2,880
Net increase (decrease) in cash and cash equivalents	(62,425)	(74,898)	61,549
Cash and cash equivalents at beginning of year	346,345	421,243	359,694
Cash and cash equivalents at end of year	$ 283,920	$ 346,345	$ 421,243