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Finance Receivables - Summary of contracts included in finance receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables, net $ 236,241   $ 266,573      
Finance receivables            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses (19,176) $ (19,065) (20,266) $ (20,749) $ (19,153) $ (17,658)
Finance receivables | Contracts and direct loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables 267,236   301,155      
Accrued interest receivable 2,542   2,642      
Unearned dealer discounts (11,352)   (13,655)      
Unearned insurance and fee commissions (3,009)   (3,303)      
Finance receivables, net of unearned 255,417   286,839      
Allowance for credit losses (19,176)   (20,266)      
Finance receivables, net $ 236,241   $ 266,573