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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 284,279	$ 267,945
Ending balance	330,887	289,233
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(41,094)	(27,932)
Other comprehensive income (loss) before reclassifications	21,196	(283)
Reclassifications from AOCI	0	0
Net current period other comprehensive (loss) income	21,196	(283)
Ending balance	(19,898)	(28,215)
Unrecognized Prior Service Cost on Pension and Other Post- Retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(397)	(489)
Other comprehensive income (loss) before reclassifications	(115)	(1)
Reclassifications from AOCI	70	71
Net current period other comprehensive (loss) income	(45)	70
Ending balance	(442)	(419)
Deferred Loss on Pension and Other Post- Retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(8,158)	(8,322)
Other comprehensive income (loss) before reclassifications	(78)	(575)
Reclassifications from AOCI	275	361
Net current period other comprehensive (loss) income	197	(214)
Ending balance	(7,961)	(8,536)
Deferred Gain (Loss) on Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	12	(229)
Other comprehensive income (loss) before reclassifications	51	(265)
Reclassifications from AOCI	41	364
Net current period other comprehensive (loss) income	92	99
Ending balance	104	(130)
Accumulated Other Comprehensive Items [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(49,637)	(36,972)
Other comprehensive income (loss) before reclassifications	21,054	(1,124)
Reclassifications from AOCI	386	796
Net current period other comprehensive (loss) income	21,440	(328)
Ending balance	$ (28,197)	$ (37,300)

X

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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