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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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