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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 332,504	$ 284,279
Ending balance	341,685	311,337
Foreign Currency Translation Adjustment [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(17,501)
Other comprehensive (loss) income before reclassifications	(10,387)
Reclassifications from AOCI	0
Net current period other comprehensive (loss) income	(10,387)
Ending balance	(27,888)
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	36
Net current period other comprehensive (loss) income	37
Ending balance	(282)
Net Actuarial Loss on Pension and Other Post- Retirement Benefit Plans [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(8,974)
Other comprehensive (loss) income before reclassifications	14
Reclassifications from AOCI	278
Net current period other comprehensive (loss) income	292
Ending balance	(8,682)
Deferred Gain (Loss) on Cash Flow Hedges [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Other comprehensive (loss) income before reclassifications	(79)
Reclassifications from AOCI	(1)
Net current period other comprehensive (loss) income	(80)
Ending balance	(1)
Accumulated Other Comprehensive Items [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	(26,715)	(49,637)
Other comprehensive (loss) income before reclassifications	(10,451)
Reclassifications from AOCI	313
Net current period other comprehensive (loss) income	(10,138)
Ending balance	$ (36,853)	$ (35,916)

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