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Finance Receivables - Summary of contracts and direct loans included in finance receivables (Details) - Finance receivables - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses $ (13,272) $ (13,530) $ (16,932) $ (19,975) $ (19,176) $ (20,266)
Contracts and direct loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables 211,813   228,994 250,279    
Accrued interest receivable 3,088   2,889 2,421    
Unearned dealer discounts (8,436)   (10,083) (10,757)    
Unearned insurance and fee commissions (2,644)   (2,826) (2,758)    
Finance receivables, net of unearned 203,821   218,974 239,185    
Purchase price discount (222)          
Allowance for credit losses (13,272)   (16,932) (19,975)    
Finance receivables, net $ 190,327   $ 202,042 $ 219,210