Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2016 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (18,830)
Other comprehensive income (loss)	(1,940)
Amounts reclassified from other comprehensive income (loss)	385	[1]
Ending Balance	(20,385)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9,698)
Other comprehensive income (loss)	(2,850)
Ending Balance	(12,548)
Pension liability
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9,132)
Other comprehensive income (loss)	910
Amounts reclassified from other comprehensive income (loss)	385	[1]
Ending Balance	$ (7,837)

[1] The amounts reclassified from other comprehensive income (loss) were included in selling, general and administrative expenses in the consolidated statements of operations.