Financial Instruments and Fair Value Measurements - Items Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) property	Mar. 31, 2021 USD ($) property	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Provisions for impairment
Provisions for impairment	$ 7,038	$ 2,720
Number of impaired properties held for sale | property	18	1
Number of impaired properties held for investment | property	0	2
Number of impaired properties sold | property	16	18
Value of properties	$ 25,648,515		$ 25,155,178
Properties impaired 2022
Provisions for impairment
Value of properties	$ 37,800		$ 44,800
Properties impaired 2021
Provisions for impairment
Value of properties		$ 13,300		$ 16,000