Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) (USD $) In Thousands, unless otherwise specified	8 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Apr. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Unpaid Claims-Claims [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	$ 3,374,224	$ 2,172,041
Subrogation recoverable	530,091	772,948
Claim liability reported on Balance Sheet, before reinsurance	3,904,315	2,944,989
Successor [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Policyholder Benefits and Claims Incurred, Ceded	(14,106)	(21,164)
Liability for Unpaid Claims and Claims Adjustment Expense, Net	5,347,877	3,698,378	5,434,517
Loss and loss expense reserves	5,968,712	4,752,007	6,106,345
Subrogation recoverable	(498,478)	(953,274)	(533,673)
Claim liability reported on Balance Sheet, before reinsurance	5,470,234	3,798,733
Unearned Premium Reserve [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(502,984)	(241,348)
Subrogation recoverable	0	0
Claim liability reported on Balance Sheet, before reinsurance	(502,984)	(241,348)
Present Value of Expected Net Cash Flows-Recoveries [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(1,797,805)	(1,205,621)
Subrogation recoverable	(1,164,179)	(2,018,398)
Claim liability reported on Balance Sheet, before reinsurance	(2,961,984)	(3,224,019)
Present Value of Expected Net Cash Flows- Claims and Loss Expenses [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	4,895,277	3,792,133
Subrogation recoverable	135,610	197,751
Claim liability reported on Balance Sheet, before reinsurance	5,030,887	3,989,884
Unpaid Claims-Accrued Interest [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	0	234,802
Subrogation recoverable	0	94,425
Claim liability reported on Balance Sheet, before reinsurance	0	329,227
Predecessor [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Policyholder Benefits and Claims Incurred, Ceded			3,889	6,996
Liability for Unpaid Claims and Claims Adjustment Expense, Net			5,434,517	5,974,731	6,230,780
Loss and loss expense reserves			6,106,345
Subrogation recoverable			$ (533,673)