Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes	$ (4,247)	$ (16,277)	$ (16,816)	$ (76,063)
Income tax benefit	685	2,247	1,720	4,408
Loss from continuing operations	(3,562)	(14,030)	(15,096)	(71,655)
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	2,339	794	6,651	2,381
Income tax benefit	(906)	(314)	(2,534)	(941)
Loss from continuing operations	1,433	480	4,117	1,440
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	$ 2,339	$ 794	$ 6,651	$ 2,381