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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Activity in Storage facilities      
Balance at beginning of year $ 5,489,754 $ 4,699,844 $ 4,463,455
Acquisitions & improvements 1,795,965 825,247 364,324
Fully depreciated assets (52,722) (83,418) (81,717)
Dispositions and other (19,408) (8,533) (3,033)
Construction in progress, net (30,095) 14,718 (43,185)
Right-of-use assets - finance leases   41,896  
Balance at end of year 7,183,494 5,489,754 4,699,844
Activity in Accumulated depreciation      
Balance at beginning of year 983,940 925,359 862,487
Depreciation expense 160,933 143,952 145,233
Fully depreciated assets (52,722) (83,418) (81,717)
Dispositions and other (6,327) (1,953) (644)
Balance at end of year 1,085,824 983,940 925,359
Storage properties, net 6,097,670 $ 4,505,814 $ 3,774,485
Aggregate cost of real estate investments for federal income tax purposes $ 7,452,800