Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 64,047	$ 95,401	$ 81,241
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	41,398	42,822	41,259
Amortization	13,741	6,850	5,190
Deferred income taxes	7,055	(12,781)	12,027
Asset impairments	142	1,201	802
Thailand flood insurance recovery	0	0	(550)
Gain on sale of subsidiary	0	0	(1,547)
Gain on the sale of property, plant and equipment	(224)	(85)	(78)
Stock-based compensation expense	5,322	7,709	6,427
Excess tax benefit from stock-based compensation	(663)	(481)	(634)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	37,573	52,847	37,862
Inventories	27,749	3,974	(6,153)
Prepaid expenses and other assets	3,147	(3,202)	(1,278)
Accounts payable	76,039	(41,388)	(36,646)
Accrued liabilities	(596)	(5,104)	(1,178)
Income taxes	(2,210)	(959)	(1,304)
Net cash provided by operations	272,520	146,804	135,440
Cash flows from investing activities:
Proceeds from sales of investments at par	200	50	10,282
Additions to property, plant and equipment	(30,478)	(37,128)	(44,211)
Proceeds from the sale of property, plant and equipment	357	605	452
Additions to purchased software	(1,856)	(934)	(1,178)
Business acquisitions, net of cash acquired	10,750		750
Business acquisitions, net of cash acquired		(229,582)
Proceeds from sale of subsidiary, net of cash disposed	0	0	5,512
Thailand flood property insurance proceeds	0	0	550
Other	(218)	188	367
Net cash used in investing activities	(21,245)	(266,801)	(27,476)
Cash flows from financing activities:
Proceeds from stock options exercised	18,825	1,976	18,867
Excess tax benefits from stock-based compensation	663	481	634
Borrowings under credit agreement	25,000	250,000	0
Principal payments on long-term debt and capital lease obligations	(37,301)	(20,676)	(582)
Share repurchases	(41,929)	(68,365)	(43,800)
Debt issuance costs	0	(3,779)	0
Net cash provided by (used in) financing activities	(34,742)	159,637	(24,881)
Effect of exchange rate changes	(1,095)	(1,021)	(1,262)
Net increase in cash and cash equivalents	215,438	38,619	81,821
Cash and cash equivalents at beginning of year	465,995	427,376	345,555
Cash and cash equivalents at end of period	$ 681,433	$ 465,995	$ 427,376