Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 27, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 368,255
Other comprehensive income (loss)	(2,831)
Amounts reclassified from accumulated other comprehensive income (loss)	747	[1]
Ending Balance	402,877
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(22,527)
Ending Balance	(24,611)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(12,485)
Other comprehensive income (loss)	(3,144)
Ending Balance	(15,629)
Pension Liability Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(10,042)
Other comprehensive income (loss)	313
Amounts reclassified from accumulated other comprehensive income (loss)	747	[1]
Ending Balance	$ (8,982)

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