Income Taxes Income Taxes - Effective Tax Rates Differing From Prevailing Federal Corporate Income Tax Rates (Details) - Successor [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Effective Tax Rates [Line Items]
Tax on income from continuing operations at statutory rate	$ 36,759	$ 178,521	$ 172,639
Tax on income from continuing operations at statutory rate,tax rate	35.00%	35.00%	35.00%
Tax-exempt interest	$ (1,561)	$ (1,454)	$ (6,811)
Tax-exempt interest, tax rate	(1.50%)	(0.30%)	(1.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Amount	$ 0	$ 180,079	$ 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent	0.00%	35.30%	0.00%
Derivative, Gain (Loss) on Derivative, Net	$ (545,731)	$ 270,917	$ (585,038)
Valuation allowance	$ 139,584	$ (340,133)	$ (159,661)
Valuation allowance, tax rate	132.90%	(66.70%)	(32.40%)
Foreign taxes	$ 26,183	$ 288	$ 3,472
Foreign taxes, tax rate	24.90%	0.10%	0.70%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	$ (171,687)	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	(163.50%)	0.00%	0.00%
Other, net	$ 1,431	$ 63	$ (82)
Other, net, tax rate	1.40%	0.00%	0.00%
Income tax expense (benefit)	$ 30,709	$ 17,364	$ 9,557
Effective Income Tax Rate Reconciliation, Percent	29.20%	3.40%	1.90%
Financial Guarantee [Member] | Credit Derivatives [Member] | Net Change in Fair Value of Credit Derivatives [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 20,106	$ 41,701	$ 23,906
Financial Services Derivatives Products [Member] | Derivative Products [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(50,273)	(42,544)	(181,087)
Financial Services Derivatives Products [Member] | Futures Contracts [Member] | Derivative Products [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(191)	(1,367)	(7,472)
Financial Services Derivatives Products [Member] | Interest Rate Swaps [Member] | Derivative Products [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(50,082)	(41,177)	(173,615)
Variable Interest Entity, Primary Beneficiary [Member] | Income Loss On Variable Interest Entities [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(515,564)	271,760	(427,857)
Variable Interest Entity, Primary Beneficiary [Member] | Currency Swaps [Member] | Income Loss On Variable Interest Entities [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	58,990	103,757	24,577
Variable Interest Entity, Primary Beneficiary [Member] | Interest Rate Swaps [Member] | Income Loss On Variable Interest Entities [Member]
Reconciliation of Effective Tax Rates [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (574,554)	$ 168,003	$ (452,434)