Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 368,255
Other comprehensive income (loss)	(254)
Amounts reclassified from accumulated other comprehensive income (loss)	501	[1]
Ending Balance	386,182
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(22,527)
Ending Balance	(22,280)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(12,485)
Other comprehensive income (loss)	(323)
Ending Balance	(12,808)
Pension Liability Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(10,042)
Other comprehensive income (loss)	69
Amounts reclassified from accumulated other comprehensive income (loss)	501	[1]
Ending Balance	$ (9,472)

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