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Finance Receivables - Activity in allowance for credit losses (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items]                    
Provision for credit losses $ 3,919 $ 4,597 $ 4,000 $ 4,385 $ 11,165 $ 7,871 $ 8,374 $ 5,426 $ 16,901 $ 32,836
Charge-offs         (6,400)          
Finance receivables                    
Accounts Notes And Loans Receivable [Line Items]                    
Balance at beginning of year       16,932       20,266 16,932 20,266
Provision for credit losses                 16,901 32,836
Charge-offs                 (29,837) (38,152)
Recoveries                 7,166 1,982
Balance at end of year 11,162       16,932       11,162 16,932
Finance receivables | Indirect                    
Accounts Notes And Loans Receivable [Line Items]                    
Balance at beginning of year       16,575       19,433 16,575 19,433
Provision for credit losses                 16,096 32,715
Charge-offs                 (29,174) (37,514)
Recoveries                 6,936 1,941
Balance at end of year 10,433       16,575       10,433 16,575
Finance receivables | Direct                    
Accounts Notes And Loans Receivable [Line Items]                    
Balance at beginning of year       $ 357       $ 833 357 833
Provision for credit losses                 805 121
Charge-offs                 (663) (638)
Recoveries                 230 41
Balance at end of year $ 729       $ 357       $ 729 $ 357