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Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Income taxes receivable, net | $ 380,058 | $ 239,578 |
Navient |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Deferred tax asset discount |  |  | $ 27,000
Income taxes receivable, net | 3,000 |  | $ 291,000
Deferred tax liability | $ 3,000 |  |

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