Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 29, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 368,255
Other comprehensive income (loss)	2,105
Amounts reclassified from accumulated other comprehensive income (loss)	251	[1]
Ending Balance	379,701
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(22,527)
Ending Balance	(20,171)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(12,485)
Other comprehensive income (loss)	2,339
Ending Balance	(10,146)
Pension Liability Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(10,042)
Other comprehensive income (loss)	(234)
Amounts reclassified from accumulated other comprehensive income (loss)	251	[1]
Ending Balance	$ (10,025)

[1] The amounts reclassified from other comprehensive income (loss) were included in other income (expense) in the consolidated statements of operations.