Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Operating activities:
Net income	$ 32,514	$ 16,212
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,977	13,700
Amortization	10,945	11,289
Share-based compensation expense	3,870	2,861
Provision for deferred income taxes	3,422	(211)
Other	3,633	4,796
Changes in operating assets and liabilities:
Trade accounts and notes receivable	(7,546)	(6,799)
Inventories	(5,415)	(12,998)
Accounts payable and accrued liabilities	(23,490)	(9,510)
Other current assets	5,061	1,796
Income taxes payable and refundable income taxes	(1,252)	(726)
Other	(2,287)	(3,071)
Net cash provided by operating activities	33,432	17,339
Investing activities:
Acquisition of property, plant and equipment	(22,190)	(17,819)
Proceeds from sale and maturities of short-term investments	0	932
Other	186	(3,427)
Net cash used in investing activities	(22,004)	(20,314)
Financing activities:
Payments of long-term debt	(25,000)	0
Issuance of common stock	1,041	0
Repurchase and retirement of common stock	(4,000)	(3,573)
Taxes paid related to net share settlement of equity awards	(4,575)	(2,067)
Other	(270)	49
Net cash used in financing activities	(32,804)	(5,591)
Effect of exchange rate changes on cash and cash equivalents	6,146	3,144
Decrease in cash and cash equivalents	(15,230)	(5,422)
Cash and cash equivalents at beginning of period	406,389	349,825
Cash and cash equivalents at end of period	$ 391,159	$ 344,403