Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 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)	(5,927)	2,486
Balance, end of the period	(52,125)	(60,755)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		445
Interest Expense [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Before Tax		723
Provision for income taxes [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		(278)
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)	(6,044)	1,945
Balance, end of the period	(51,193)	(58,354)
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	445
Balance, end of the period	0	(1,352)
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)