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Debt - Mortgage Loans Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
extension
property
loan
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Apr. 30, 2014
Debt Instrument [Line Items]        
Debt instrument, unamortized discount $ 19,912   $ 26,464  
Investments in debt securities, net 392,860   $ 378,545  
Payments on mortgage loans $ 3,416,296 $ 2,086,622    
Residential Real Estate        
Debt Instrument [Line Items]        
Number of real estate properties | property 43,701   47,616  
Secured Debt        
Debt Instrument [Line Items]        
Debt instrument, unamortized discount $ 0      
Payments on mortgage loans $ 3,416,296 $ 2,086,622    
Secured Debt | Class G Certificates        
Debt Instrument [Line Items]        
Debt instrument, loan principal as a percentage of mortgage pool       5.00%
Stated interest rate 0.0005%      
Secured Debt | IH 2015-1, IH 2015-2, IH 2015-3, IH 2017-2, IH 2018-1, CAH 2014-1, CAH 2014-2, CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1        
Debt Instrument [Line Items]        
Debt instrument, extended term 1 year      
Secured Debt | IH 2017-1        
Debt Instrument [Line Items]        
Number of loans | loan 2      
Debt instrument, term 10 years      
Debt instrument, unamortized discount $ 3,081   $ 3,345  
Stated interest rate 4.23%      
Secured Debt | IH 2017-1 | Class B Certificates        
Debt Instrument [Line Items]        
Stated interest rate 4.23%      
Secured Debt | Minimum | Class F Certificates        
Debt Instrument [Line Items]        
Stated interest rate 3.73%      
Secured Debt | Minimum | IH 2015-1, IH 2015-2, IH 2015-3, IH 2017-2, IH 2018-1, CAH 2014-1, CAH 2014-2, CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1        
Debt Instrument [Line Items]        
Number of loans | loan 5      
Debt instrument, term 2 years      
Debt instrument, number of extensions | extension 2      
Secured Debt | Minimum | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3        
Debt Instrument [Line Items]        
Basis spread 0.76%      
Secured Debt | Maximum | Class F Certificates        
Debt Instrument [Line Items]        
Stated interest rate 5.08%      
Secured Debt | Maximum | IH 2015-1, IH 2015-2, IH 2015-3, IH 2017-2, IH 2018-1, CAH 2014-1, CAH 2014-2, CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1        
Debt Instrument [Line Items]        
Number of loans | loan 7      
Debt instrument, term 3 years      
Debt instrument, number of extensions | extension 5      
Secured Debt | Maximum | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3        
Debt Instrument [Line Items]        
Basis spread 3.47%