Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Sep. 30, 2014	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ (162)		$ (60)	$ 4,789
Loss Reserves Ceded To Reinsurers	27,478		44,059	74,519	$ 100,355
Policyholder Benefits and Claims Incurred, Ceded	(9,454)	$ (20,601)
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,615,598		2,814,754	$ 3,417,343	$ 3,698,378
Loss and loss expense reserves	4,303,547		4,088,106
Subrogation recoverable	(660,471)		(1,229,293)
Claim liability reported on Balance Sheet, before reinsurance	3,643,076		2,858,813
Unpaid Claims-Claims [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	2,348,259		2,138,952
Subrogation recoverable	635,735		828,802
Claim liability reported on Balance Sheet, before reinsurance	2,983,994		2,967,754
Unpaid Claims-Accrued Interest [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	417,508		349,668
Subrogation recoverable	115,320		141,349
Claim liability reported on Balance Sheet, before reinsurance	532,828		491,017
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	3,090,003		3,265,349
Subrogation recoverable	200,258		207,674
Claim liability reported on Balance Sheet, before reinsurance	3,290,261		3,473,023
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	(1,384,282)		(1,476,276)
Subrogation recoverable	(1,611,784)		(2,407,118)
Claim liability reported on Balance Sheet, before reinsurance	(2,996,066)		(3,883,394)
Unearned Premium Reserve [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(167,941)		(189,587)
Subrogation recoverable	0		0
Claim liability reported on Balance Sheet, before reinsurance	$ (167,941)		$ (189,587)