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Fair Values of Assets and Liabilities, Other Relevant Data (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Nov. 30, 2005
May 31, 2005
Schedule of Fair Value Assets And Liabilities [Line Items]        
Revolving credit facilities $ 64,992 $ 28,900    
Structured Financing Notes Payable [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance of notes payable 103,716 106,956    
Aggregate fair value of notes payable 15,626 20,970    
Loans and Fees Receivable, at Fair Value [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 6,011 8,560    
Aggregate fair value of loans and fees receivable that are reported at fair value 5,255 6,353    
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 5 12    
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable 270 374    
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 20,504 25,837    
Aggregate fair value of loans and fees receivable that are reported at fair value 15,265 20,353    
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 28 31    
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable $ 559 $ 889    
5.875% Convertible Senior Notes Due 2035 [Member]        
Schedule of Fair Value Assets And Liabilities [Line Items]        
Interest rate on notes     5.875% 5.875%