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Debt (Narrative) (Details) - USD ($)
Oct. 07, 2015
Aug. 13, 2015
Jun. 12, 2015
May. 22, 2015
Sep. 15, 2014
Apr. 07, 2014
Feb. 27, 2014
Jan. 02, 2014
Feb. 26, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 14, 2014
Aug. 31, 2014
May. 08, 2014
Jan. 22, 2014
Oct. 31, 2013
Aug. 31, 2013
Debt Instrument [Line Items]                                  
Loans held for investment that are pledged as collateral                   $ 417,100,000 $ 431,000,000            
Senior Subordinated Notes                                  
Debt Instrument [Line Items]                                  
Line of credit at 16 percent (borrowings up to)                             $ 8,000,000    
Line of credit at 12 percent (borrowings in excess of)                             8,000,000    
ODAC Agreement | Revolving Credit Facility | ODAC                                  
Debt Instrument [Line Items]                                  
Line of credit               $ 50,000,000               $ 25,000,000  
ODAC Agreement | Revolving Credit Facility | ODAC | LIBOR                                  
Debt Instrument [Line Items]                                  
Variable interest spread               8.25%                  
SSL&SA Agreement                                  
Debt Instrument [Line Items]                                  
Amount of debt repaid             $ 30,000,000                    
SSL&SA Agreement | Senior Subordinated Notes                                  
Debt Instrument [Line Items]                                  
Line of credit                                 $ 8,000,000
SSL&SA Agreement | Senior Subordinated Notes | Secured Debt                                  
Debt Instrument [Line Items]                                  
Line of credit                             $ 18,000,000    
SBLP II Agreement | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Amount of debt repaid           $ 63,300,000                      
ODART Agreement | Revolving Credit Facility | Class A                                  
Debt Instrument [Line Items]                                  
Line of credit $ 150,000,000                                
ODART Agreement | Revolving Credit Facility | Class B                                  
Debt Instrument [Line Items]                                  
Variable interest spread 7.00%                                
Line of credit before election $ 17,600,000.0                                
Maximum capacity at election $ 167,600,000.0                                
Borrowing base 95.00%                                
ODART Agreement | Revolving Credit Facility | Cost of funds | Class A                                  
Debt Instrument [Line Items]                                  
Variable interest spread 2.25%                                
ODAST Agreement | Secured Debt | ODAST | Deutsche Bank                                  
Debt Instrument [Line Items]                                  
Securitization agreement                           $ 175,000,000      
Minimum aggregate principal balance required                           183,200,000.0      
ODAST Agreement | Secured Debt | ODAST | Deutsche Bank | Class A                                  
Debt Instrument [Line Items]                                  
Line of credit                           $ 156,700,000.0      
Interest rate                           3.15%      
ODAST Agreement | Secured Debt | ODAST | Deutsche Bank | Class B                                  
Debt Instrument [Line Items]                                  
Line of credit                           $ 18,300,000.0      
Interest rate                           5.68%      
ODAP Agreement | Revolving Credit Facility | ODAP | Jefferies Mortgage Funding, LLC                                  
Debt Instrument [Line Items]                                  
Line of credit   $ 100,000,000                     $ 75,000,000        
Interest rate floor   4.00%                              
ODAP Agreement | Revolving Credit Facility | ODAP | LIBOR | Jefferies Mortgage Funding, LLC | Maximum                                  
Debt Instrument [Line Items]                                  
Variable interest spread   1.00%                              
ODART Agreement Due September 2016 | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Line of credit         $ 167,600,000.0             $ 111,800,000.0          
ODART Agreement Due September 2016 | Revolving Credit Facility | Class A                                  
Debt Instrument [Line Items]                                  
Line of credit         150,000,000             100,000,000          
ODART Agreement Due September 2016 | Revolving Credit Facility | Class B                                  
Debt Instrument [Line Items]                                  
Line of credit         $ 17,600,000.0             $ 11,800,000.0          
Interest rate floor         7.25%                        
ODART Agreement Due September 2016 | Revolving Credit Facility | LIBOR | Class B                                  
Debt Instrument [Line Items]                                  
Variable interest spread         1.00%                        
ODART Agreement Due September 2016 | Revolving Credit Facility | Cost of funds | Class A                                  
Debt Instrument [Line Items]                                  
Variable interest spread         3.00%                        
RAOD Agreement | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Line of credit       $ 50,000,000                          
RAOD Agreement | Revolving Credit Facility | Subsequent Event                                  
Debt Instrument [Line Items]                                  
Line of credit                 $ 100,000,000                
RAOD Agreement | Revolving Credit Facility | LIBOR                                  
Debt Instrument [Line Items]                                  
Variable interest spread       3.00%                          
PORT Agreement | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Line of credit     $ 100,000,000                            
PORT Agreement | Revolving Credit Facility | LIBOR                                  
Debt Instrument [Line Items]                                  
Variable interest spread     2.25%