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Real Estate Facilities (Schedule Of Real Estate Activities) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
Beginning balance (Operating facilities, at cost) $ 17,372,627  
Capital expenditures to maintain real estate facilities 177,641  
Acquisitions 2,741,952  
Dispositions (6,783)  
Developed or expanded facilities opened for operation 171,086  
Ending balance (Operating facilities, at cost) 20,456,523  
Beginning balance (Accumulated depreciation) (7,152,135)  
Depreciation expense (450,757)  
Dispositions 4,396  
Ending balance (Accumulated depreciation) (7,598,496)  
Beginning balance (Construction in process) 188,079  
Costs incurred to develop and expand real estate facilities 211,386  
Developed or expanded facilities opened for operation (171,086)  
Ending balance (Construction in process) 228,379  
Total real estate facilities $ 13,086,406 $ 10,408,571