Debt (Schedule of Debt) (Details) - USD ($) shares in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
	Aug. 26, 2015	Mar. 06, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jul. 15, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt			$ 3,027,824		$ 3,027,824			$ 3,081,205
Debt discount, net			(14,959)		(14,959)			(18,293)
Debt issuance costs			(46,086)		(46,086)			(54,765)
Less: liabilities subject to compromise			(74,275)		(74,275)
Less: current debt			(156)		(156)			(12,327)
Total long-term debt			0		0			3,068,878
Common stock issued in exchange of debt instrument (in shares)		8,650
Aggregate principal amount of debt exchanged	$ 1,900,000
Gain on extinguishment of debt			0	$ 3,394	58,626	$ 902
2011 term loan B
Debt Instrument [Line Items]
Total debt			978,178		978,178		$ 978,200	978,178
Debt discount, net			(9,400)		(9,400)			(11,900)
Debt issuance costs			$ (11,600)		$ (11,600)			(14,700)
Weighted average stated interest rate (as a percent)			7.25%		7.25%
9.50% senior secured notes
Debt Instrument [Line Items]
Total debt			$ 970,000		$ 970,000		$ 970,000	970,000
Debt discount, net			(2,500)		(2,500)			(2,700)
Debt issuance costs			$ (15,400)		$ (15,400)			(17,800)
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]
Total debt			$ 360,500		$ 360,500		$ 360,500	350,000
Debt issuance costs			$ (6,700)		$ (6,700)			(7,400)
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]
Total debt			$ 388,000		$ 388,000		$ 388,000	388,000
Debt discount, net			(2,000)		(2,000)			(2,200)
Debt issuance costs			$ (6,500)		$ (6,500)			(7,100)
Weighted average stated interest rate (as a percent)			9.875%		9.875%		9.875%
8.50% senior notes
Debt Instrument [Line Items]
Total debt			$ 383,275		$ 383,275		$ 383,300	450,000
Debt issuance costs			$ (5,800)		$ (5,800)			(7,500)
Weighted average stated interest rate (as a percent)		8.50%	8.50%		8.50%		8.50%
Aggregate principal amount of debt exchanged		$ 66,700
Gain on extinguishment of debt		$ 58,600
Other
Debt Instrument [Line Items]
Total debt			$ 8,916		$ 8,916			18,085
Debt
Debt Instrument [Line Items]
Less: liabilities subject to compromise			$ (3,027,668)		$ (3,027,668)			$ 0