Property And Equipment (Gain On Sale Of Property) (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] $ in Thousands, $ in Millions	Sep. 30, 2021 USD ($)	Feb. 28, 2021 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2021 AUD ($)	Dec. 31, 2020 USD ($)
Real Estate Properties [Line Items]
Sale price	$ 3,803
Net book value	(1,425)
Gain on sale, gross of direct costs	2,378
Direct costs incurred	(6)
Gain on sale, net of direct costs	2,372
Coachella, CA [Member]
Real Estate Properties [Line Items]
Sale price	11,000
Net book value	(4,351)				$ (4,400)
Gain on sale, gross of direct costs	6,649
Direct costs incurred	(301)
Gain on sale, net of direct costs	6,348
Manukau, NZ [Member]
Real Estate Properties [Line Items]
Sale price	56,058
Net book value	(13,618)				$ (13,600)
Gain on sale, gross of direct costs	42,440
Direct costs incurred	(1,514)
Gain on sale, net of direct costs	40,926
New South Wales [Member]
Real Estate Properties [Line Items]
Sale price	69,579
Net book value	(30,231)
Gain on sale, gross of direct costs	39,348
Direct costs incurred	(622)
Gain on sale, net of direct costs	38,726
Chicago [Member]
Real Estate Properties [Line Items]
Sale price	7,075
Net book value	(1,824)	$ (1,800)	$ (30,200)	$ (39.1)
Gain on sale, gross of direct costs	5,251
Direct costs incurred	(295)
Gain on sale, net of direct costs	$ 4,956