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Debt - Mortgage Loans Narrative (Details)
$ in Thousands
6 Months Ended
Jul. 19, 2018
USD ($)
Jun. 30, 2018
USD ($)
extension
property
loan
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Apr. 30, 2014
Debt Instrument [Line Items]          
Debt instrument, unamortized discount   $ 22,132   $ 26,464  
Investments in debt securities, net   483,381   $ 378,545  
Repayment proceeds   59,213 $ 30,916    
Payments on mortgage loans   $ 3,198,588 2,083,012    
Residential Real Estate          
Debt Instrument [Line Items]          
Number of real estate properties | property   43,825   47,616  
Secured Debt          
Debt Instrument [Line Items]          
Debt instrument, unamortized discount   $ 0      
Payments on mortgage loans   $ 3,198,588 $ 2,083,012    
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   $ 3,169   $ 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          
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          
Debt Instrument [Line Items]          
Basis spread   3.47%      
Subsequent Event | Secured Debt | IH 2015-3          
Debt Instrument [Line Items]          
Repayment proceeds $ 71,770