Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Jul. 15, 2015	Mar. 06, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 3,027,824	$ 3,027,824			$ 3,081,205
Letters of Credit Outstanding, Amount			$ 70,200
Accrued expenses	$ 53,332	$ 53,332			125,318
Percentage of accrued but unpaid interest due under Amended Final Cash Collateral Order	100.00%	100.00%
Interest due under Restructuring Agreement (as a percent)			80.00%
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	$ 69,200	$ 207,900
2011 term loan B
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 978,178	$ 978,178	$ 978,200		978,178
Accrued expenses			8,800
Weighted average stated interest rate (as a percent)	7.25%	7.25%
9.50% senior secured notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 970,000	$ 970,000	970,000		970,000
Accrued expenses			$ 23,000
Weighted average stated interest rate (as a percent)	9.50%	9.50%	9.50%
11.00% / 12.00% senior secured PIK toggle notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 360,500	$ 360,500	$ 360,500		350,000
Accrued expenses			$ 12,000
11.00% / 12.00% senior secured PIK toggle notes | Minimum
Debt Instrument [Line Items]
Weighted average stated interest rate (as a percent)	11.00%	11.00%	11.00%
11.00% / 12.00% senior secured PIK toggle notes | Maximum
Debt Instrument [Line Items]
Weighted average stated interest rate (as a percent)	12.00%	12.00%	12.00%
9.875% senior notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 388,000	$ 388,000	$ 388,000		388,000
Accrued expenses			$ 22,400
Weighted average stated interest rate (as a percent)	9.875%	9.875%	9.875%
8.50% senior notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 383,275	$ 383,275	$ 383,300		$ 450,000
Accrued expenses			$ 8,100
Weighted average stated interest rate (as a percent)	8.50%	8.50%	8.50%	8.50%