Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2018 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 311,545
Other comprehensive income (loss)	3,309
Amounts reclassified from accumulated other comprehensive income (loss)	246	[1]
Ending Balance	318,611
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(17,880)
Ending Balance	(14,325)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(8,313)
Other comprehensive income (loss)	3,671
Ending Balance	(4,642)
Pension Liability Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9,567)
Other comprehensive income (loss)	(362)
Amounts reclassified from accumulated other comprehensive income (loss)	246	[1]
Ending Balance	$ (9,683)

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