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Finance Receivables - Reconciliation of changes in allowance for credit losses on direct loans (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Provision for credit losses $ 5,426 $ 9,752
Finance receivables | Direct Loans    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 833 773
Provision for credit losses 199 94
Charge-offs (90) (101)
Recoveries 7 8
Balance at end of period $ 949 $ 774