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Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Apr. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Income taxes receivable, net $ 366,247 $ 380,058  
Navient      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Deferred tax asset discount     $ 27,000
Income taxes receivable, net $ 0