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Segment Information (Summary Of Segment Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenue $ 4,182,163 $ 3,415,824 $ 2,915,068
Depreciation and amortization (888,146) (713,428) (553,257)
General and administrative (114,742) (101,254) (83,199)
Interest and other income 40,567 12,306 22,323
Interest expense (136,319) (90,774) (56,283)
Equity in earnings of unconsolidated real estate entities 106,981 232,093 80,497
Foreign currency exchange gain (loss) 98,314 111,787 (97,953)
Gain on sale of real estate 1,503 13,683 1,493
Gain on sale of equity investment in PS Business Parks, Inc. 2,128,860 0 0
Net income 4,366,274 1,959,639 1,361,227
Operating Segments      
Segment Reporting Information [Line Items]      
Net income 2,241,110 1,781,798 1,494,349
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
General and administrative (114,742) (101,254) (83,199)
Interest and other income 40,567 12,306 22,323
Interest expense (136,319) (90,774) (56,283)
Equity in earnings of unconsolidated real estate entities 106,981 232,093 80,497
Foreign currency exchange gain (loss) 98,314 111,787 (97,953)
Gain on sale of real estate 1,503 13,683 1,493
Gain on sale of equity investment in PS Business Parks, Inc. 2,128,860 0 0
Self-Storage Operations Reportable Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 3,946,028 3,203,566 2,721,630
Cost of operations (980,209) (852,030) (807,543)
Net operating income 2,965,819 2,351,536 1,914,087
Depreciation and amortization (888,146) (713,428) (553,257)
Net income 2,077,673 1,638,108 1,360,830
Ancillary Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 236,135 212,258 193,438
Net operating income 163,437 143,690 133,519
Cost of operations $ (72,698) $ (68,568) $ (59,919)