Finance Receivables - Narratives (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) property loan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) property loan	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) loan
Finance Receivables
Allowance for credit loss			$ (6,249)	$ 1,906
Interest income from direct financing leases	$ 16,200	$ 18,800	33,300	38,900
Net investments in direct financing leases	657,360		657,360			$ 711,974
Land, buildings and improvements	11,621,204		11,621,204			$ 10,939,619
Increase (decrease) in value of balance sheet item due to foreign currency translation	$ 5,973	$ 13,847	$ (7,929)	(38,353)
Number of loans receivable (loans) | loan	2		2			2
Loans receivable	$ 24,100		$ 24,100			$ 24,100
Loans receivable, allowance for credit losses	12,600		12,600			12,600
Interest receivable					$ 3,700	$ 3,700
Interest income from loans receivables	1,200		1,800	1,000
Adjustments
Finance Receivables
Net investments in direct financing leases	(13,800)		(13,800)
Land, buildings and improvements	$ 13,800		13,800
Direct financing lease
Finance Receivables
Increase (decrease) in value of balance sheet item due to foreign currency translation			$ (9,200)
Direct financing lease
Finance Receivables
Number of properties sold (property) | property			4
Decrease in direct financing lease related to sales			$ 35,800
Direct financing lease | Adjustments
Finance Receivables
Number of real estate properties (property) | property	1		1
Net investments in direct financing lease
Finance Receivables
Allowance for credit loss			$ (6,200)	$ 1,900