Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015
Operating activities:
Net income	$ 49,102	$ 39,320
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	27,525	26,724
Amortization	22,351	24,235
Share-based compensation expense	6,366	5,145
Provision for deferred income taxes	(931)	3,035
Other	9,204	(8,136)
Changes in operating assets and liabilities:
Trade accounts and notes receivable	(36,099)	(28,594)
Inventories	(11,389)	(28,500)
Accounts payable and accrued liabilities	13,555	(9,126)
Other current assets	5,693	4,449
Income taxes payable and refundable income taxes	407	(364)
Other	(7,246)	7,926
Net cash provided by operating activities	78,538	36,114
Investing activities:
Acquisition of property, plant and equipment	(32,144)	(34,230)
Proceeds from sale and maturities of short-term investments	1,726	1,607
Other	(3,384)	318
Net cash used in investing activities	(33,802)	(32,305)
Financing activities:
Payments of long-term debt	(25,000)	(75,000)
Issuance of common stock	2,380	974
Repurchase and retirement of common stock	(3,573)	0
Taxes paid related to net share settlement of equity awards	(2,203)	(2,403)
Other	91	352
Net cash used in financing activities	(28,305)	(76,077)
Effect of exchange rate changes on cash and cash equivalents	7,487	(3,689)
Increase (decrease) in cash and cash equivalents	23,918	(75,957)
Cash and cash equivalents at beginning of period	349,825	389,699
Cash and cash equivalents at end of period	$ 373,743	$ 313,742