Supplemental Stockholders' Equity Information - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 28, 2014		Sep. 29, 2013	Sep. 28, 2014		Sep. 29, 2013
Reclassification out of accumulated other comprehensive income (loss):
Effect of other postretirement benefit remeasurement (2)				$ 9,525
Effect of other postretirement benefit remeasurement				13,756
(Loss)/income from continuing operations	(12,440)		(5,300)	(533)		18,170
Income tax expense	(10,247)		2,578	(12,226)		21,473
Funded Status of Benefit Plans [Member]
Reclassification out of accumulated other comprehensive income (loss):
Effect of other postretirement benefit remeasurement (2)				9,525
Effect of other postretirement benefit remeasurement				13,756
Funded Status of Benefit Plans [Member] | Reclassification out of accumulated other comprehensive income (loss) [Member]
Reclassification out of accumulated other comprehensive income (loss):
Amortization of prior service credit	(2,286)	[1]		(6,456)	[1]
Amortization of actuarial loss	8,882	[1]		26,646	[1]
Effect of other postretirement benefit remeasurement (2)	13,756			13,756
Effect of other postretirement benefit remeasurement	9,525	[2]		9,525	[2]
(Loss)/income from continuing operations	29,877	[3]		43,471	[3]
Income tax expense	9,410			14,551
Total reclassification, net of tax	$ 20,467			$ 28,920

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost for pension and other postretirement benefits. See Note 9 for additional information.

[2] See Note 9 for additional information on the effect of other postretirement benefit remeasurement.

[3] There were no reclassifications relating to noncontrolling interest for the three and nine months ended September 28, 2014.