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Arrangements with Navient Corporation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Deferred taxes to be indemnified |  |  |  |  |  |  | $ 283,000
Amount remaining | $ 9,000 |  |  |  | $ 9,000 |  |
Remaining balance of indemnification receivable in connection with the spin-off | 27,000 |  |  |  | 27,000 |  |
Liability for uncertainty in income taxes | 26,000 |  |  |  | 26,000 |  |
Adjustment for tax positions relating to historical transactions among entities |  |  |  |  | 120,000 |  |
Increase (decrease) in tax indemnification receivable | (90,000) |  |  | $ 120,000 | (26,991) | $ (44,725) |
Adjustment for tax positions expired as a result of federal statute of limitations | 90,000 |  |  |  |  |  |
Liability for uncertainty in income taxes relating to historical transactions | 20,000 |  |  |  | 20,000 |  |
Gain on sale of portfolio split loans | $ 0 |  | $ 0 |  | $ 2,060 | $ 0 |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Portfolio split loans sold |  | $ 43,000 |  |  |  |  |
Gain on sale of portfolio split loans |  | $ 2,000 |  |  |  |  |

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