Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes	$ (2,522)	$ (40,011)	$ (10,235)	$ (57,358)
Income tax benefit	103	710	169	1,270
Loss from continuing operations	(2,419)	(39,301)	(10,066)	(56,088)
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	2,156	794	4,312	1,587
Income tax benefit	(814)	(314)	(1,628)	(627)
Loss from continuing operations	1,342	480	2,684	960
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	$ 2,156	$ 794	$ 4,312	$ 1,587