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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 514,577	$ 501,009
Other comprehensive income (loss) before reclassifications	524	376
Tax (expense) or benefit	(609)	150
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(499)	207
Ending balance	553,074	495,881
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	31	(1,188)
Other comprehensive income (loss) before reclassifications	(1,944)	779
Tax (expense) or benefit	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Ending balance	(1,913)	(409)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(132)	(105)
Other comprehensive income (loss) before reclassifications	(125)	68
Tax (expense) or benefit	26	(24)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Ending balance	(231)	(61)
Pension and Post-retirement Liabilities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,630)	(5,167)
Other comprehensive income (loss) before reclassifications	0	0
Tax (expense) or benefit	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Ending balance	(5,630)	(5,167)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	2,120	1,460
Other comprehensive income (loss) before reclassifications	2,593	(471)
Tax (expense) or benefit	(635)	174
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(499)	207
Ending balance	3,579	1,370
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(3,611)	(5,000)
Ending balance	$ (4,195)	$ (4,267)

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

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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