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Finance Receivables - Summary of contracts and direct loans included in finance receivables (Details) - Finance receivables - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Accounts Notes And Loans Receivable [Line Items]        
Allowance for credit losses $ (16,112) $ (16,932) $ (19,065) $ (20,266)
Contracts and direct loans        
Accounts Notes And Loans Receivable [Line Items]        
Finance receivables 235,931 228,994 286,391  
Accrued interest receivable 3,158 2,889 2,609  
Unearned dealer discounts (9,533) (10,083) (13,345)  
Unearned insurance and fee commissions (2,715) (2,826) (3,253)  
Finance receivables, net of unearned 226,841 218,974 272,402  
Purchase price discount (1,303)      
Allowance for credit losses (16,112) (16,932) (19,065)  
Finance receivables, net $ 209,426 $ 202,042 $ 253,337