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Finance Receivables - Summary of reconciliation of changes in allowance for credit losses on contracts (Details 2) - 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 | Contracts    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance at beginning of period 19,433 16,885
Provision for credit losses 5,227 9,658
Charge-offs (7,049) (8,691)
Recoveries 505 527
Balance at end of period $ 18,116 $ 18,379