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Other Assets - Schedule of Changes in allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance     $ 4,400  
Ending balance $ 8,600   8,600  
Automotive Dealer Financing Notes [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 9,586 $ 164 4,371 $ 27
Provision (1,019) 108 4,196 245
Ending balance $ 8,567 $ 272 $ 8,567 $ 272