Financial Instruments and Fair Value Measurements - Items Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) property	Jun. 30, 2021 USD ($) property	Jun. 30, 2022 USD ($) property	Jun. 30, 2021 USD ($) property
Provisions for impairment
Less: total provisions for impairment	$ (7,691)	$ (17,246)	$ (14,729)	$ (19,966)
Number of impaired properties held for sale | property	9	1	23	1
Number of impaired properties held for investment | property	3	5	3	6
Number of impaired properties sold | property	32	31	49	44
Properties impaired 2022
Provisions for impairment
Carrying value prior to impairment	$ 64,500	$ 45,600	$ 98,200	$ 59,200
Less: total provisions for impairment	(7,700)	(17,200)	(14,700)	(20,000)
Carrying value after impairment	$ 56,800	$ 28,400	$ 83,500	$ 39,200