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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Activity in Storage facilities      
Balance at beginning of year $ 7,367,613 $ 7,295,778 $ 7,183,494
Acquisitions & improvements 324,653 74,259 191,495
Fully depreciated assets (27,573) (29,133) (32,344)
Dispositions and other (632) (4,717) (6,230)
Construction in progress, net (35,287) 31,426 (40,637)
Balance at end of year 7,628,774 7,367,613 7,295,778
Activity in Accumulated depreciation      
Balance at beginning of year 1,416,377 1,247,775 1,085,824
Depreciation expense 201,942 199,065 195,522
Fully depreciated assets (27,573) (29,133) (32,344)
Dispositions and other (158) (1,330) (1,227)
Balance at end of year 1,590,588 1,416,377 1,247,775
Storage properties, net 6,038,186 $ 5,951,236 $ 6,048,003
Aggregate cost of real estate investments for federal income tax purposes $ 8,047,800