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Finance Receivables - Summary of contracts included in finance receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, net $ 256,590 $ 269,876
Finance receivables | Contracts and direct loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables 286,391 301,155
Accrued Interest 2,609 2,642
Unearned dealer discounts (13,345) (13,655)
Finance receivables, net of unearned dealer discounts 275,655 290,142
Allowance for credit losses (19,065) (20,266)
Finance receivables, net $ 256,590 $ 269,876