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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - Finance receivables - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 246,653 $ 309,748
Finance receivables 250,279 313,631
Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 233,394 291,370
Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 13,259 18,378
Chapter 13 bankruptcy accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 3,626 3,883
Contract Portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 238,183 301,544
Finance receivables 241,747 305,387
Contract Portfolio | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 225,110 283,340
Contract Portfolio | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 13,073 18,204
Contract Portfolio | Chapter 13 bankruptcy accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 3,564 3,843
Direct Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 8,470 8,204
Finance receivables 8,532 8,244
Direct Loans | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 8,284 8,030
Direct Loans | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 186 174
Direct Loans | Chapter 13 bankruptcy accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 62 $ 40