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Income Taxes Income Taxes - Effective Tax Rates Differing From Prevailing Federal Corporate Income Tax Rates (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Successor [Member]
Reconciliation of Effective Tax Rates [Line Items]
Tax on income from continuing operations at statutory rate		$ 179,311	$ 178,521	$ 172,639
Tax on income from continuing operations at statutory rate,tax rate		35.00%	35.00%	35.00%
Reorganization Income		$ 0	$ 0	$ 0
Reorganization Income, tax rate		(0.00%)	(0.00%)	(0.00%)
Tax bankruptcy adjustments		$ 0	$ 0	$ 0
Tax bankruptcy adjustments, tax rate		0.00%	0.00%	0.00%
IRS settlement		$ 0	$ 0	$ 0
IRS settlement, tax rate		0.00%	0.00%	0.00%
Tax-exempt interest		$ (11,988)	$ (1,454)	$ (6,811)
Tax-exempt interest, tax rate		(2.30%)	(0.30%)	(1.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Amount			$ 180,079
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent			35.30%
Valuation allowance		$ (160,064)	$ (340,133)	$ (159,661)
Valuation allowance, tax rate		(31.20%)	(66.70%)	(32.40%)
Foreign taxes		$ 0	$ 288	$ 3,472
Foreign taxes, tax rate		0.00%	0.10%	0.70%
Other, net		$ 255	$ 63	$ (82)
Other, net, tax rate		0.00%	0.00%	0.00%
Income tax expense (benefit)		$ 7,514	$ 17,364	$ 9,557
Effective Income Tax Rate Reconciliation, Percent		1.50%	3.40%	1.90%
Predecessor [Member]
Reconciliation of Effective Tax Rates [Line Items]
Tax on income from continuing operations at statutory rate	$ 1,171,812
Tax on income from continuing operations at statutory rate,tax rate	35.00%
Reorganization Income	$ (712,581)
Reorganization Income, tax rate	(21.30%)
Tax bankruptcy adjustments	$ 285,734
Tax bankruptcy adjustments, tax rate	8.50%
IRS settlement	$ 370,996
IRS settlement, tax rate	11.10%
Tax-exempt interest	$ (4,996)
Tax-exempt interest, tax rate	(0.10%)
Valuation allowance	$ (1,110,230)
Valuation allowance, tax rate	(33.20%)
Foreign taxes	$ 0
Foreign taxes, tax rate	0.00%
Other, net	$ 20
Other, net, tax rate	0.00%
Income tax expense (benefit)	$ 755
Effective Income Tax Rate Reconciliation, Percent	0.00%

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