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4. Debt (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Warehouse lines of credit $ 81,683 $ 194,056
Residual interest financing 6,856 9,042
Subordinated renewable notes 14,353 15,138
Debt issuance costs 2,100 2,400
Total other debt outstanding $ 104,945 $ 220,641
Residual interest financing [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Interest rate 11.75% over one month Libor  
Maturity date April 2018  
Subordinated renewable notes [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Interest rate 8.01% 9.04%
Maturity date July 2018 October 2017
Warehouse lines of credit [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Warehouse lines of credit $ 56,197 $ 91,504
Interest rate 5.50% over one month Libor (Minimum 6.50%)  
Maturity date April 2019  
Warehouse lines of credit (2) [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Warehouse lines of credit $ 14,539 73,940
Interest rate 5.50% over one month Libor (Minimum 6.25%)  
Maturity date August 2019  
Warehouse lines of credit (3) [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Warehouse lines of credit $ 13,000 31,017
Interest rate 6.75% over a commercial paper rate (Minimum 7.75%)  
Maturity date November 2019  
Residual interest financing [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Residual interest financing $ 6,856 9,042
Subordinated renewable notes [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Subordinated renewable notes $ 14,353 $ 15,138