Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 95,401	$ 81,241	$ 110,945
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	42,822	41,259	36,179
Amortization	6,850	5,190	4,763
Deferred income taxes	(12,781)	12,027	(5,786)
Asset impairments	1,201	802	5,504
Thailand flood insurance recovery	0	(550)	(10,748)
Gain on sale of subsidiary	0	(1,547)	0
Gain on the sale of property, plant and equipment	(85)	(78)	(1,161)
Stock-based compensation expense	7,709	6,427	7,053
Excess tax benefit from stock-based compensation	(481)	(634)	(354)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	52,847	37,862	(56,633)
Inventories	3,974	(6,153)	(17,832)
Prepaid expenses and other assets	(3,202)	(1,278)	6,335
Accounts payable	(41,388)	(36,646)	19,725
Accrued liabilities	(5,104)	(1,178)	(9,305)
Income taxes	(959)	(1,304)	10,178
Net cash provided by operations	146,804	135,440	98,863
Cash flows from investing activities:
Proceeds from sales of investments at par	50	10,282	821
Additions to property, plant and equipment	(37,128)	(44,211)	(26,829)
Proceeds from the sale of property, plant and equipment	605	452	1,908
Additions to purchased software	(934)	(1,178)	(1,908)
Business acquisition, net of cash acquired	(229,582)	750	(94,271)
Proceeds from sale of subsidiary, net of cash disposed	0	5,512	0
Thailand flood property insurance proceeds	0	550	10,748
Other	188	367	814
Net cash used in investing activities	(266,801)	(27,476)	(108,717)
Cash flows from financing activities:
Proceeds from stock options exercised	1,976	18,867	11,203
Excess tax benefits from stock-based compensation	481	634	354
Borrowings under credit agreement	250,000	0	0
Principal payments on long-term debt and capital lease obligations	(20,676)	(582)	(497)
Share repurchases	(68,365)	(43,800)	(41,168)
Debt issuance costs	(3,779)	0	0
Net cash provided by (used in) financing activities	159,637	(24,881)	(30,108)
Effect of exchange rate changes	(1,021)	(1,262)	938
Net increase (decrease) in cash and cash equivalents	38,619	81,821	(39,024)
Cash and cash equivalents at beginning of year	427,376	345,555	384,579
Cash and cash equivalents at end of period	$ 465,995	$ 427,376	$ 345,555