Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - Successor [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Policyholder Benefits and Claims Incurred, Ceded	$ (5,421)	$ (47,085)	$ (21,164)
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,665,271	2,814,754	$ 3,698,378	$ 5,347,877
Loss and loss expense reserves	4,380,769	4,088,106
Subrogation recoverable	(684,731)	(1,229,293)
Claim liability reported on Balance Sheet, before reinsurance	3,696,038	2,858,813
Unpaid Claims-Claims [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	2,411,105	2,138,952
Subrogation recoverable	583,042	828,802
Claim liability reported on Balance Sheet, before reinsurance	2,994,147	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	529,703	349,668
Subrogation recoverable	132,139	141,349
Claim liability reported on Balance Sheet, before reinsurance	661,842	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	2,681,198	3,265,349
Subrogation recoverable	68,419	207,674
Claim liability reported on Balance Sheet, before reinsurance	2,749,617	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	(1,098,096)	(1,476,276)
Subrogation recoverable	(1,468,331)	(2,407,118)
Claim liability reported on Balance Sheet, before reinsurance	(2,566,427)	(3,883,394)
Unearned Premium Reserve [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(143,141)	(189,587)
Subrogation recoverable	0	0
Claim liability reported on Balance Sheet, before reinsurance	$ (143,141)	$ (189,587)