Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 55,980	$ 57,903
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	32,298	30,384
Amortization	4,192	3,601
Deferred income taxes	7,481	10,649
Gain on the sale of property, plant and equipment	(56)	(22)
Asset impairments	84	794
Thailand flood insurance recovery	0	(550)
Stock-based compensation expense	6,021	5,626
Excess tax benefit from stock-based compensation	(345)	(558)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	52,217	24,691
Inventories	(21,059)	(38,603)
Prepaid expenses and other assets	(9,015)	(3,088)
Accounts payable	(9,222)	17,545
Accrued liabilities	529	7,643
Income taxes	(383)	(2,647)
Net cash provided by operations	118,722	113,368
Cash flows from investing activities:
Proceeds from sales and redemptions of investments	50	10,056
Additions to property, plant and equipment	(31,980)	(35,743)
Proceeds from the sale of property, plant and equipment	477	289
Additions to purchased software	(902)	(871)
Business acquisition, net of cash acquired	0	750
Thailand flood property insurance proceeds	0	550
Other	187	363
Net cash used in investing activities	(32,168)	(24,606)
Cash flows from financing activities:
Proceeds from stock options exercised	1,683	11,748
Excess tax benefits from stock-based compensation	345	558
Principal payments on capital lease obligations	(500)	(431)
Share repurchases	(52,323)	(25,045)
Net cash used in financing activities	(50,795)	(13,170)
Effect of exchange rate changes	(1,041)	(911)
Net increase in cash and cash equivalents	34,718	74,681
Cash and cash equivalents at beginning of year	427,376	345,555
Cash and cash equivalents at end of period	$ 462,094	$ 420,236