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Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Income taxes receivable, net | $ 374,706 | $ 88,844 |
Navient |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Deferred tax asset discount |  |  | $ 27,000
Deferred tax liability | $ 7,000 |  |
Income taxes receivable, net |  | $ 7,000 | $ 291,000

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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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