Financial Instruments and Fair Value Measurements - Items Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) property	Sep. 30, 2021 USD ($) property	Sep. 30, 2022 USD ($) property	Sep. 30, 2021 USD ($) property
Provisions for impairment
Less: total provisions for impairment	$ (1,650)	$ (11,011)	$ (16,379)	$ (30,977)
Number of impaired properties held for sale | property	3	0	3	0
Number of impaired properties held for investment | property	0	1	5	7
Number of impaired properties sold | property	20	22	69	57
Properties impaired 2022
Provisions for impairment
Carrying value prior to impairment	$ 48,100	$ 35,000	$ 107,000	$ 85,700
Less: total provisions for impairment	(1,700)	(11,000)	(16,400)	(31,000)
Carrying value after impairment	$ 46,400	$ 24,000	$ 90,600	$ 54,700