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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, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Provision for credit losses $ 11,165 $ 7,871 $ 8,374 $ 5,426 $ 8,563 $ 8,989 $ 10,146 $ 9,752 $ 32,836 $ 37,450
Finance receivables                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Balance at beginning of year       20,266       17,658 20,266 17,658
Provision for credit losses                 32,836 37,450
Charge-offs                 (38,152) (36,719)
Recoveries                 1,982 1,877
Balance at end of year 16,932       20,266       16,932 20,266
Finance receivables | Indirect                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Balance at beginning of year       19,433       16,885 19,433 16,885
Provision for credit losses                 32,715 36,890
Charge-offs                 (37,514) (36,183)
Recoveries                 1,941 1,841
Balance at end of year 16,575       19,433       16,575 19,433
Finance receivables | Direct                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Balance at beginning of year       $ 833       $ 773 833 773
Provision for credit losses                 121 560
Charge-offs                 (638) (536)
Recoveries                 41 36
Balance at end of year $ 357       $ 833       $ 357 $ 833