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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 332,504	$ 284,279
Ending balance	358,439	330,887
Foreign Currency Translation Adjustment [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(17,501)
Other comprehensive (loss) income before reclassifications	(11,504)
Reclassifications from AOCI	0
Net current period other comprehensive (loss) income	(11,504)
Ending balance	(29,005)
Unrecognized Prior Service Cost on Retirement Benefit Plans [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(319)
Other comprehensive (loss) income before reclassifications	1
Reclassifications from AOCI	54
Net current period other comprehensive (loss) income	55
Ending balance	(264)
Net Actuarial Loss on Retirement Benefit Plans [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(8,974)
Other comprehensive (loss) income before reclassifications	0
Reclassifications from AOCI	417
Net current period other comprehensive (loss) income	417
Ending balance	(8,557)
Deferred Gain on Cash Flow Hedges [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Other comprehensive (loss) income before reclassifications	34
Reclassifications from AOCI	(14)
Net current period other comprehensive (loss) income	20
Ending balance	99
Accumulated Other Comprehensive Items [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(26,715)	(49,637)
Other comprehensive (loss) income before reclassifications	(11,469)
Reclassifications from AOCI	457
Net current period other comprehensive (loss) income	(11,012)
Ending balance	$ (37,727)	$ (28,197)

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