Schedule IV - Real Estate Mortgage Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Monthly Debt Service	$ 3,278,000
Face Value	553,648
Net Book Value	552,797	$ 642,218	$ 427,117	$ 565,875
Prior Liens	$ 1,194,100
First Mortgages | Multiple
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Maturity Date	Mar. 31, 2025
Monthly Debt Service	$ 388,310
Face Value	66,000
Net Book Value	66,000
Prior Liens	$ 174,020
Mezzanine Loans | Multiple
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of RE Assets | loan	156
Interest Rate	6.58%
Maturity Date	Jun. 09, 2021
Monthly Debt Service	$ 2,889,690
Face Value	487,648
Net Book Value	486,797
Prior Liens	$ 1,020,080
Mortgage Loans On Real Estate, Ohion Fixed Rate Loans Due 2021 | First Mortgages | Multiple
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of RE Assets | loan	7
Interest Rate	9.24%