Other Comprehensive Loss (Income) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ (7,947)	$ (328)	$ (24,186)	$ 1,092
Tax	0	89	(18)	144
Total change in other comprehensive (loss) income	(7,947)	(239)	(24,168)	1,236
Pension and postretirement liability and reclassification adjustments
Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(115)	(149)	630	(585)
Tax	0	89	(18)	144
Total change in other comprehensive (loss) income	(115)	(60)	648	(441)
Unrealized gain (loss) on investments
Other Comprehensive Income (Loss) [Line Items]
Pre-tax	0	(1,710)	0	(1,235)
Tax	0	0	0	0
Total change in other comprehensive (loss) income	0	(1,710)	0	(1,235)
Foreign currency translation adjustment
Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(7,832)	1,531	(24,816)	2,912
Tax	0	0	0	0
Total change in other comprehensive (loss) income	$ (7,832)	$ 1,531	$ (24,816)	$ 2,912