Supplemental Financial Information (Parent - Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Expenses [Abstract]
General and administrative	$ 1,595	$ 4,567	$ 7,196	$ 10,629
Other Nonoperating Income (Expense) [Abstract]
Other income (expense), net	(514)	(284)	(2,436)	(323)
Income (loss) before income taxes	98,452	(4,229)	90,272	(5,986)
Income Tax Expense (Benefit)	45	(1,133)	(305)	(3,405)
Net Income (Loss)	98,407	(3,096)	90,577	(2,581)
Parent [Member]
Operating Expenses [Abstract]
General and administrative	272	147	334	319
Other Nonoperating Income (Expense) [Abstract]
Interest expense (excludes contractual interest expense of $19.5 million and $32.9 million for the three and nine months ended September 30, 2016, respectively)	0	20,267	26,590	60,802
Income (loss) from unconsolidated affiliates	98,756	12,464	191,792	39,709
Guaranty fee income	0	5,784	6,073	17,240
Other income (expense), net	(13)	(2,091)	(64,840)	(1,888)
Reorganization items parent, net	(19)	0	(15,758)	0
Income (loss) before income taxes	98,452	(4,257)	90,343	(6,060)
Income Tax Expense (Benefit)	45	(1,161)	(234)	(3,479)
Net Income (Loss)	$ 98,407	$ (3,096)	$ 90,577	$ (2,581)