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Other Assets - Narrative (Details)
3 Months Ended
Dec. 31, 2019
USD ($)
property
Mar. 31, 2020
USD ($)
property
Mar. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]        
Investments in debt securities, net $ 316,991,000 $ 311,540,000    
Debt Instrument, Unamortized Discount   9,441,000    
Held-to-maturity securities, unrecognized holding gain 0      
Held-to-maturity securities, unrecognized holding loss 0      
Other than temporary impairment recognized in other comprehensive income 0      
Operating Lease, Variable Lease Income   25,047,000 $ 21,330,000  
Investments in equity securities 16,650,000 16,734,000    
Equity Securities, FV-NI, Gain (Loss)   34,000 $ 0  
Debt Issuance Costs, Line of Credit Arrangements, Gross       $ 9,673,000
Debt issuance costs, unamortized balance $ 2,765,000 2,172,000    
Debt securities, held to maturity, allowance for credit loss   $ 0    
Joint venture with FNMA | Merger with Starwood Waypoint Homes        
Schedule of Investments [Line Items]        
Interest joint venture   10.00%    
Number of real estate properties owned by joint venture | property 641 618    
Minimum        
Schedule of Investments [Line Items]        
Lessor leasing arrangements, operating leases, term of contract   12 months    
Residential Mortgage Backed Securities        
Schedule of Investments [Line Items]        
Investments in debt securities, net   $ 311,540,000    
Residential Mortgage Backed Securities | Minimum        
Schedule of Investments [Line Items]        
Marketable securities, expected maturity term   2 months    
Residential Mortgage Backed Securities | Maximum        
Schedule of Investments [Line Items]        
Marketable securities, expected maturity term   7 years    
Mortgage Loans        
Schedule of Investments [Line Items]        
Debt Instrument, Unamortized Discount   $ 0    
IH1 2017-1 | Mortgage Loans        
Schedule of Investments [Line Items]        
Debt Instrument, Unamortized Discount $ 2,641,000 $ 2,553,000