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Land, Buildings and Improvements and Assets Held for Sale - Narratives (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) property $ / €	Mar. 31, 2021 USD ($) property	Dec. 31, 2021 USD ($) property $ / €
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation	$ (9,152)	$ (13,902)
Net investments in direct financing leases and loans receivable	547,751		$ 572,205
Land, buildings and improvements	12,031,896		$ 11,875,407
Investments in real estate
Capitalized construction cost	$ 25,900
Construction projects completed (property) \| property	6		6
Unfunded commitment	$ 53,800		$ 55,300
Capitalized interest	700	700
Lease termination income	8,200
Lease payments	4,700	800
Assets held for sale, net	$ 0		$ 8,269
EUR
Real Estate Properties
Decrease in exchange rate	(2.00%)
Foreign currency exchange rate \| $ / €	1.1101		1.1326
Real Estate
Real Estate Properties
Number of real estate properties (property) \| property	1,336
Investments in real estate
Other income	$ 600	$ 500
Properties disposed of by sale
Investments in real estate
Number of properties sold (property) \| property	6	2
Asset held for sale, not in discontinued operations
Real Estate Properties
Number of real estate properties (property) \| property			2
Investments in real estate
Assets held for sale, net			$ 8,300
Land, buildings and improvements \| Properties disposed of by sale
Investments in real estate
Number of properties sold (property) \| property	4
Decrease in carrying value of real estate	$ 7,000
Construction in progress
Real Estate Properties
Number of real estate properties (property) \| property	2
Investments in real estate
Funding commitment	$ 2,100
Operating Lease
Real Estate Properties
Increase (decrease) in value of balance sheet item due to foreign currency translation	$ (78,000)
Number of real estate properties (property) \| property	37
Depreciation	$ 72,000	$ 67,000
Operating real estate
Real Estate Properties
Depreciation	$ 700	$ 700
Self-storage \| Operating real estate
Real Estate Properties
Number of real estate properties (property) \| property	10		10
Hotel \| Operating real estate
Real Estate Properties
Number of real estate properties (property) \| property	1		1
Adjustments
Real Estate Properties
Net investments in direct financing leases and loans receivable	$ (17,300)
Land, buildings and improvements	$ 17,300
Direct financing lease \| Adjustments
Real Estate Properties
Number of real estate properties (property) \| property	1