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Other Assets - Narrative (Details)		3 Months Ended		9 Months Ended
	Dec. 31, 2019 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items]
Investments in debt securities, net	$ 316,991,000	$ 309,122,000		$ 309,122,000
Debt Instrument, Unamortized Discount		6,888,000		6,888,000
Debt Securities, Held-to-maturity, Allowance for Credit Loss		0		0
Held-to-maturity securities, unrecognized holding gain	0	0		0
Held-to-maturity securities, unrecognized holding loss	0
Other than temporary impairment recognized in other comprehensive income	0
Operating Lease, Variable Lease Income		23,762,000	$ 24,282,000	68,422,000	$ 68,865,000
Operating Lease, Impairment Loss		1,750,000		1,750,000
Investments in equity securities	16,650,000	16,734,000		16,734,000
Equity Securities, FV-NI, Unrealized Gain (Loss)		0	$ (6,480,000)	(34,000)	$ (6,480,000)
Debt Issuance Costs, Line of Credit Arrangements, Gross						$ 9,673,000
Debt issuance costs, unamortized balance	$ 2,765,000	$ 987,000		$ 987,000
Joint venture with FNMA | Merger with Starwood Waypoint Homes
Schedule of Investments [Line Items]
Interest joint venture		10.00%		10.00%
Number of real estate properties owned by joint venture | property	641	581		581
Minimum
Schedule of Investments [Line Items]
Lessor leasing arrangements, operating leases, term of contract		12 months		12 months
Residential Mortgage Backed Securities
Schedule of Investments [Line Items]
Investments in debt securities, net		$ 309,122,000		$ 309,122,000
Residential Mortgage Backed Securities | Minimum
Schedule of Investments [Line Items]
Marketable securities, expected maturity term				1 month
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		$ 0
IH1 2017-1 | Mortgage Loans
Schedule of Investments [Line Items]
Debt Instrument, Unamortized Discount	$ 2,641,000	$ 2,377,000		$ 2,377,000

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