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Finance Receivables - Finance receivables consist of automobile finance installment Contracts and Direct Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, net $ 281,358 $ 317,205
Contracts and Direct Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, gross contract 454,277 512,720
Unearned interest (137,594) (160,853)
Finance receivables, net of unearned interest 316,683 351,867
Unearned dealer discounts (14,138) (17,004)
Finance receivables, net of unearned interest and unearned dealer discounts 302,545 334,863
Allowance for credit losses (21,187) (17,658)
Finance receivables, net $ 281,358 $ 317,205