Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance	$ (6,791)
Other comprehensive income before reclassifications	(9,989)
Tax effect	0
Other comprehensive income before reclassifications, net of tax	(9,989)
Amounts reclassified out of AOCI	2,064
Tax effect	(607)
Amounts reclassified out of AOCI, net of tax	1,457
Net other comprehensive income	(8,532)	$ 28,631
Ending Balance	(15,323)
Pension and Other Post-Retirement Actuarial Items [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance	(58,291)
Other comprehensive income before reclassifications	0
Tax effect	0
Other comprehensive income before reclassifications, net of tax	0
Amounts reclassified out of AOCI	2,064
Tax effect	(607)
Amounts reclassified out of AOCI, net of tax	1,457
Net other comprehensive income	1,457
Ending Balance	(56,834)
Currency Translation Adjustment [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance	51,500
Other comprehensive income before reclassifications	(9,989)
Tax effect	0
Other comprehensive income before reclassifications, net of tax	(9,989)
Amounts reclassified out of AOCI	0
Tax effect	0
Amounts reclassified out of AOCI, net of tax	0
Net other comprehensive income	(9,989)
Ending Balance	41,511
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance	(6,791)
Net other comprehensive income	(8,532)	$ 28,631
Ending Balance	$ (15,323)