Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) income from discontinued operations, net of taxes	$ (8,607)	$ 1,372	$ (9,671)	$ 3,043
Loss from continuing operations before income taxes	(20,297)	9,046	(35,626)	69,207
Income tax (benefit) expense	854	(987)	6,704	(4,060)
(Loss) income from continuing operations	(19,443)	8,059	(28,922)	65,147
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes	2,630	2,900	7,854	9,805
Income tax (benefit) expense	2,035	0	0	0
(Loss) income from continuing operations	4,665	2,900	7,854	9,805
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) income from discontinued operations, net of taxes	0	393	0	2,338
Pension and Other Postretirement Benefits [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net actuarial losses	$ 2,630	$ 2,507	$ 7,854	$ 7,467