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Finance Receivables - Summary of contracts and direct loans included in finance receivables (Details) - Finance receivables - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses $ (13,502) $ (16,112) $ (16,932) $ (19,176) $ (19,065) $ (20,266)
Contracts and direct loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables 222,320   228,994 267,236    
Accrued interest receivable 3,046   2,889 2,542    
Unearned dealer discounts (8,995)   (10,083) (11,352)    
Unearned insurance and fee commissions (2,741)   (2,826) (3,009)    
Finance receivables, net of unearned 213,630   218,974 255,417    
Purchase price discount (676)          
Allowance for credit losses (13,502)   (16,932) (19,176)    
Finance receivables, net $ 199,452   $ 202,042 $ 236,241