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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Activity in Storage facilities      
Balance at beginning of year $ 7,295,778 $ 7,183,494 $ 5,489,754
Acquisitions & improvements 74,259 191,495 1,795,965
Fully depreciated assets (29,133) (32,344) (52,722)
Dispositions and other (4,717) (6,230) (19,408)
Construction in progress, net 31,426 (40,637) (30,095)
Balance at end of year 7,367,613 7,295,778 7,183,494
Activity in Accumulated depreciation      
Balance at beginning of year 1,247,775 1,085,824 983,940
Depreciation expense 199,065 195,522 160,933
Fully depreciated assets (29,133) (32,344) (52,722)
Dispositions and other (1,330) (1,227) (6,327)
Balance at end of year 1,416,377 1,247,775 1,085,824
Storage properties, net 5,951,236 $ 6,048,003 $ 6,097,670
Aggregate cost of real estate investments for federal income tax purposes $ 7,719,600