Real Estate Facilities (Schedule Of Real Estate Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating facilities, at cost:
Beginning balance (Operating facilities, at cost)	$ 17,372,627	$ 16,289,146	$ 15,296,844
Capital expenditures to maintain real estate facilities	284,200	163,834	192,539
Acquisitions	4,940,413	781,219	421,097
Dispositions	(7,408)	(303)	(426)
Developed or expanded facilities opened for operation	218,001	138,731	379,092
Ending balance (Operating facilities, at cost)	22,807,833	17,372,627	16,289,146
Accumulated depreciation:
Beginning balance (Accumulated depreciation)	(7,152,135)	(6,623,475)	(6,140,072)
Depreciation expense	(625,968)	(528,660)	(483,408)
Dispositions	4,795	0	5
Ending balance (Accumulated depreciation)	(7,773,308)	(7,152,135)	(6,623,475)
Construction in process:
Beginning balance (Construction in process)	188,079	141,934	285,339
Costs incurred to develop and expand real estate facilities	302,393	188,102	235,687
Write-off of cancelled projects	0	(3,226)	0
Developed or expanded facilities opened for operation	(218,001)	(138,731)	(379,092)
Ending balance (Construction in process)	272,471	188,079	141,934
Total real estate facilities	$ 15,306,996	$ 10,408,571	$ 9,807,605