Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Operating activities:
Net income	$ 111,911	$ 72,505
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	31,699	28,388
Amortization	23,683	21,952
Share-based compensation expense	8,557	7,909
Provision for deferred income taxes	(1,757)	3,207
Other	4,640	10,130
Changes in operating assets and liabilities:
Trade accounts and notes receivable	2,687	(3,032)
Inventories	(22,472)	(13,837)
Accounts payable and accrued liabilities	(14,966)	(13,313)
Other current assets	1,976	4,014
Income taxes payable and refundable income taxes	(7,515)	2,957
Other	(1,337)	(2,289)
Net cash provided by operating activities	137,106	118,591
Investing activities:
Acquisition of property, plant and equipment	(47,437)	(42,492)
Acquisition of businesses, net of cash acquired	(380,225)	(20,000)
Other	1,905	211
Net cash used in investing activities	(425,757)	(62,281)
Financing activities:
Payments of long-term debt	(27,000)	(50,000)
Payments for dividends	(19,802)	0
Issuance of common stock	3,027	2,905
Repurchase and retirement of common stock	(20,000)	(8,000)
Taxes paid related to net share settlement of equity awards	(14,413)	(5,239)
Other	1,504	(1,270)
Net cash used in financing activities	(76,684)	(61,604)
Effect of exchange rate changes on cash and cash equivalents	(2,967)	4,540
Decrease in cash and cash equivalents	(368,302)	(754)
Cash and cash equivalents at beginning of period	625,408	406,389
Cash and cash equivalents at end of period	257,106	405,635
Supplemental Cash Flow Information [Abstract]
Capital Expenditures Incurred but Not yet Paid	8,090	4,930
Capital Lease Obligations Incurred	0	4,768
Schedule of interest and taxes paid
Interest paid	9,159	14,548
Income taxes paid, net of refunds received	$ 31,881	$ 14,605