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Preferred Equity and Mezzanine Loan Investments (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) loan
Concentration Risk [Line Items]
Unrealized losses, net	$ 100	$ 5,800
Total				$ 180,045
Tennessee | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		12.30%	12.30%
Florida | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		12.00%	12.00%
Georgia | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		11.80%	11.80%
Texas | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		10.40%	10.60%
Alabama | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		10.00%	10.00%
South Carolina | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		6.30%	6.30%
New Jersey | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Geographic concentration, percent		5.00%	5.00%
90 days or greater delinquent
Concentration Risk [Line Items]
Fair Value	3,383	$ 3,383
Unpaid Principal Balance	3,363	3,363
Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Number of delinquent loans | loan				0
VIE, Not Primary Beneficiary | Preferred equity and mezzanine loan investments
Concentration Risk [Line Items]
Investment amount	185,459	185,459		$ 181,409
Deferred loan fees, net	(1,266)	(1,266)		(1,364)
Unrealized losses, net		(3,343)	$ 0
Total	$ 180,850	$ 180,850		$ 180,045
Number of delinquent loans | loan				0

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