Provisions for Impairments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($) property
Provisions for impairment
Provisions for impairment | $	$ 11,011	$ 105,095	$ 30,977	$ 123,442
Number of impaired properties held for sale	11	1	12	2
Number of impaired properties held for investment	0	16	12	23
Number of impaired properties sold	12	26	40	43
Additional Disclosures by Disposal Groups [Line Items]
Number of properties owned	7,018		7,018
Held-for-sale
Additional Disclosures by Disposal Groups [Line Items]
Number of properties owned	36		36