Schedule IV - Real Estate Mortgage Loans (Mortgage Loan Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning Balance	$ 642,218	$ 427,117	$ 565,875
New loans	66,000	1,234,244	9,900
Construction draws	0	0	0
Total additions	66,000	1,234,244	9,900
Principal repayments	(155,170)	(1,011,353)	(148,658)
Total deductions	(155,170)	(1,011,353)	(148,658)
Effect of foreign currency translation	(251)	(7,790)	0
Ending Balance	$ 552,797	$ 642,218	$ 427,117