Impairments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($) property
Provisions for impairment
Provisions for impairment | $	$ 105,095	$ 13,503	$ 123,442	$ 31,236
Number of impaired properties held for sale	8	1	9	1
Number of impaired properties held for investment	18	2	28	4
Number of impaired properties sold	17	24	31	36
COVID-19 impacted properties
Provisions for impairment
Provisions for impairment | $	$ 81,600		$ 89,800
Number of impaired properties held for investment	17		25
COVID-19 impacted properties | Theaters
Provisions for impairment
Provisions for impairment | $	$ 79,000
Number of impaired properties held for investment	12
Other properties
Provisions for impairment
Provisions for impairment | $	$ 23,500		$ 33,600