Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 11,052	$ 14,205
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	10,621	10,933
Amortization	3,286	1,205
Deferred income taxes	633	1,818
Gain on the sale of property, plant and equipment	(93)	(14)
Asset impairments	121	84
Stock-based compensation expense	2,113	1,940
Excess tax benefit from stock-based compensation	(149)	(328)
Changes in operating assets and liabilities, net of effects from business acquisition:
Accounts receivable	65,382	28,361
Inventories	22,756	(26,914)
Prepaid expenses and other assets	(5,403)	(4,432)
Accounts payable	(31,940)	(32,978)
Accrued liabilities	(2,067)	(5,074)
Income taxes	201	289
Net cash provided by (used in) operations	76,513	(10,905)
Cash flows from investing activities:
Proceeds from sales of investments at par	0	1
Additions to property, plant and equipment	(7,700)	(16,312)
Proceeds from the sale of property, plant and equipment	130	412
Additions to purchased software	(137)	(515)
Other	62	55
Net cash used in investing activities	(7,645)	(16,359)
Cash flows from financing activities:
Proceeds from stock options exercised	763	821
Excess tax benefits from stock-based compensation	149	328
Principal payments on long-term debt and capital lease obligations	(3,078)	(155)
Share repurchases	(14,205)	(15,778)
Net cash used in financing activities	(16,371)	(14,784)
Effect of exchange rate changes	675	(1,732)
Net increase (decrease) in cash and cash equivalents	53,172	(43,780)
Cash and cash equivalents at beginning of year	465,995	427,376
Cash and cash equivalents at end of period	$ 519,167	$ 383,596