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Preferred Equity and Mezzanine Loan Investments (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) loan	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) loan
Concentration Risk [Line Items]
Unrealized losses, net	$ 5,600
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	10.30%	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%
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	$ 183,808		$ 181,409
Deferred loan fees, net	(1,300)		(1,364)
Unrealized losses, net	(3,216)	$ 0
Total	$ 179,292		$ 180,045
Number of delinquent loans | loan	0

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