Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of mortgage loans:
Balance at beginning of year	$ 293,752	$ 145,686	$ 249,071
Additions:
New mortgage loans	842,912	193,505	0
Draws on existing loans	337	20,844	45,961
Interest added	11,815	0	0
Total additions	855,064	214,349	45,961
Deductions:
Collections of principal	(214,132)	(17,019)	(87,249)
Loan balance transferred to non-real estate loans receivable	(9,142)	(53,071)	(64,040)
Change in allowance for credit losses and charge-offs	(6,984)	(5,645)	0
Other	(29,619)	(329)	0
Total deductions	(259,877)	(76,064)	(151,289)
Change in balance due to foreign currency translation	11,837	(9,781)	(1,944)
Balance at end of year	$ 877,102	$ 293,752	$ 145,686