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Arrangements with Navient Corporation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred taxes to be indemnified         $ 283,000
Amount remaining $ 18,000   $ 18,000    
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    
Liability for uncertainty in income taxes relating to historical transactions 110,000   110,000    
Gain on sale of portfolio split loans 2,060 $ 0 2,060 $ 0  
Discontinued Operations, Disposed of by Sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Portfolio split loans sold 43,000   $ 43,000    
Gain on sale of portfolio split loans $ 2,000