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Finance Receivables - Summary of contracts included in finance receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables, net $ 219,210   $ 266,573      
Finance receivables            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses (19,975) $ (19,176) (20,266) $ (21,187) $ (20,749) $ (17,658)
Finance receivables | Contracts and direct loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finance receivables 250,279   301,155 313,631    
Accrued interest receivable 2,421   2,642 3,052    
Unearned dealer discounts (10,757)   (13,655) (14,138)    
Unearned insurance and fee commissions (2,758)   (3,303) (3,313)    
Finance receivables, net of unearned 239,185   286,839 299,232    
Allowance for credit losses (19,975)   (20,266) (21,187)    
Finance receivables, net $ 219,210   $ 266,573 $ 278,045