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Debt - Mortgage Loans Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
property
extension
loan
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
Debt Instrument [Line Items]        
Investments in debt securities, net $ 311,540   $ 316,991  
Real Estate Investment Property, Net 16,216,490   $ 16,243,192  
Repayments of Secured Debt $ (107,387) $ (180,812)    
Mortgage Loans        
Debt Instrument [Line Items]        
Debt instrument, loan principal as a percentage of mortgage pool       5.00%
Mortgage Loans | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3, IH 2018-4 [Member]        
Debt Instrument [Line Items]        
Debt instrument, loan principal as a percentage of mortgage pool 5.00%      
Mortgage Loans | IH1 2017-1        
Debt Instrument [Line Items]        
Debt Instrument, Number Of Loans | loan 2      
Debt Instrument, Term 10 years      
Fixed interest rate 4.23%      
Mortgage Loans | IH1 2017-1 | Class B Certificates        
Debt Instrument [Line Items]        
Fixed interest rate 4.23%      
Mortgage Loans | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3, IH 2018-4 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Number Of Loans | loan 6      
Debt Instrument, Term 2 years      
Debt Instrument, Extended Term 1 year      
Mortgage Loans | Residential Real Estate        
Debt Instrument [Line Items]        
Number of Real Estate Properties | property 35,911   37,040  
Real Estate Investment Property, Net $ 6,922,627   $ 7,137,576  
Mortgage Loans | Minimum | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3, IH 2018-4 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term 2 years      
Debt Instrument, Number Of Extensions | extension 3      
Basis spread 0.76%      
Mortgage Loans | Maximum | SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3, IH 2018-4 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Number Of Extensions | extension 5      
Basis spread 3.47%