Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from discontinued operations, net of taxes	$ 0	$ (3,304)	$ 0	$ (5,121)
Loss from continuing operations before income taxes	(8,134)	52,975	(17,065)	66,953
Income tax (benefit) expense	6,283	(2,115)	6,522	(3,073)
(Loss) income from continuing operations	(1,851)	50,860	(10,543)	63,880
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	2,612	2,480	5,224	6,905
Income tax (benefit) expense	(1,017)	0	(2,035)	0
(Loss) income from continuing operations	1,595	2,480	3,189	6,905
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from discontinued operations, net of taxes	0	0	0	1,945
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	$ 2,612	$ 2,480	$ 5,224	$ 4,960