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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