Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes	$ (85,662)		$ (70,970)
Tax expense	28,133		24,258
Net loss	(47,485)		(46,712)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes	3,391
Tax expense	(643)
Net loss	2,748
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Qualified Pension [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss	1,156	[1]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Post-retirement Healthcare [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss	$ 2,235	[1]

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See note (7) "Employee Benefit Plans" for details.