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Other Assets - Schedule of Changes in allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance     $ 4,400  
Ending balance $ 9,600   9,600  
Automotive Dealer Financing Notes [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 10,516 $ 78 4,371 $ 27
Provision (930) 86 5,215 137
Ending balance $ 9,586 $ 164 $ 9,586 $ 164