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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Activity in Storage facilities      
Balance at beginning of year $ 7,183,494 $ 5,489,754 $ 4,699,844
Acquisitions & improvements 191,495 1,795,965 825,247
Fully depreciated assets (32,344) (52,722) (83,418)
Dispositions and other (6,230) (19,408) (8,533)
Construction in progress, net (40,637) (30,095) 14,718
Right-of-use assets - finance leases     41,896
Balance at end of year 7,295,778 7,183,494 5,489,754
Activity in Accumulated depreciation      
Balance at beginning of year 1,085,824 983,940 925,359
Depreciation expense 195,522 160,933 143,952
Fully depreciated assets (32,344) (52,722) (83,418)
Dispositions and other (1,227) (6,327) (1,953)
Balance at end of year 1,247,775 1,085,824 983,940
Storage properties, net 6,048,003 $ 6,097,670 $ 4,505,814
Aggregate cost of real estate investments for federal income tax purposes $ 7,643,800