Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Operating activities:
Net income	$ 113,407	$ 71,049
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	43,173	41,320
Amortization	33,003	33,325
Share-based compensation expense	11,457	10,063
Provision for deferred income taxes	254	(334)
Other	24,028	19,667
Changes in operating assets and liabilities:
Trade accounts and notes receivable	(15,345)	(22,252)
Inventories	(14,884)	(17,296)
Accounts payable and accrued liabilities	7,598	26,517
Other current assets	3,883	7,387
Income taxes payable and refundable income taxes	1,664	(11,364)
Other	(606)	(7,606)
Net cash provided by operating activities	207,632	150,476
Investing activities:
Acquisition of property, plant and equipment	(67,939)	(45,268)
Acquisition of business, net of cash acquired	(20,000)	0
Proceeds from sale and maturities of short-term investments	0	1,726
Other	1,074	(3,246)
Net cash used in investing activities	(86,865)	(46,788)
Financing activities:
Payments of long-term debt	(75,000)	(50,000)
Issuance of common stock	3,582	2,892
Repurchase and retirement of common stock	(18,000)	(3,573)
Taxes paid related to net share settlement of equity awards	(5,407)	(3,316)
Other	(1,270)	493
Net cash used in financing activities	(96,095)	(53,504)
Effect of exchange rate changes on cash and cash equivalents	4,136	11,768
Increase in cash and cash equivalents	28,808	61,952
Cash and cash equivalents at beginning of period	406,389	349,825
Cash and cash equivalents at end of period	435,197	411,777
Supplemental Cash Flow Information [Abstract]
Capital lease obligations incurred	4,768	0
Schedule of interest and income taxes paid [Abstract]
Interest Paid	16,167	18,995
Income Taxes Paid, Net of Refunds Received	$ 27,826	$ 24,254