Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning of year			$ (46,198)	$ (63,241)
Current-period other comprehensive income (loss)	$ (4,325)	$ 6,508	(10,252)	8,994
Balance, end of the period	(56,450)	(54,247)	(56,450)	(54,247)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		443		888
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		724		1,447
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		(281)		(559)
Foreign Currency Translation
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning of year			(45,149)	(60,299)
Current-period other comprehensive income (loss)			(10,369)	8,010
Balance, end of the period	(55,518)	(52,289)	(55,518)	(52,289)
Cash Flow Hedges
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning of year			0	(1,797)
Current-period other comprehensive income (loss)			0	888
Balance, end of the period	0	(909)	0	(909)
Pension
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance, beginning of year			(1,049)	(1,145)
Current-period other comprehensive income (loss)			117	96
Balance, end of the period	$ (932)	$ (1,049)	$ (932)	$ (1,049)