Schedule IV - Mortgage Loans on Real Estate Schedule IV - Mortgage Loans on Real Estate (Roll-Forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule IV - Mortgage Loans on Real Estate [Abstract]
Mortgage Loans on Real Estate, January 1	$ 259,491	$ 294,120	$ 202,877
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan	33,160	55,059	105,345
Amortization of Deferred Charges	741	806	440
Mortgage Loans On Real Estate Total Additions	33,901	55,865	105,785
Note Receivable, Commitment Fees, Received	0	222	108
Settlement of mortgage note by real estate acquisition	0	63,220	14,000
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Collections of Principal	62,465	27,052	434
Mortgage Loans On Real Estate, Total Deductions	62,465	90,494	14,542
Mortgage Loans on Real Estate, December 31	230,927	259,491	294,120
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross	$ 2,894,548	$ 3,265,070	$ 3,074,846	$ 2,818,365