Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from discontinued operations, net of taxes	$ 686	$ 319	$ (4,435)	$ 1,769
Loss from continuing operations before income taxes	9,732	(4,247)	76,685	(16,816)
Income tax expense (benefit)	(987)	685	(4,060)	1,720
Income (loss) from continuing operations	8,745	(3,562)	72,625	(15,096)
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	2,900	2,339	9,805	6,651
Income tax expense (benefit)	0	(906)	0	(2,534)
Income (loss) from continuing operations	2,900	1,433	9,805	4,117
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from discontinued operations, net of taxes	393	0	2,338	0
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	$ 2,507	$ 2,339	$ 7,467	$ 6,651