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STORAGE PROPERTIES - Activity (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 09, 2021 item facility $ / shares shares	Mar. 31, 2022 USD ($) facility	Dec. 31, 2021 USD ($) item facility $ / shares shares
2021 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			66
Purchase Price | $			$ 1,801,251
2021 Acquisitions | Minnesota Asset April 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 12,000
2021 Acquisitions | Maryland Asset June 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 22,075
2021 Acquisitions | New Jersey and Pennsylvania Assets July 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			2
Purchase Price | $			$ 33,000
2021 Acquisitions | Florida Asset November 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 14,750
2021 Acquisitions | Georgia Asset November 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 15,200
2021 Acquisitions | Pennsylvania Asset November 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 24,500
2021 Acquisitions | Nevada Asset December 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 21,000
2021 Acquisitions | Storage West Assets December 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			57
Purchase Price | $			$ 1,648,426
2021 Acquisitions | Illinois Asset December 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)			1
Purchase Price | $			$ 10,300
2021 Acquisitions | Acquisitions
STORAGE FACILITIES
Percentage of interest acquired		50.00%
2021 Acquisitions | Acquisitions | Minnesota Asset April 2021
STORAGE FACILITIES
Percentage of interest acquired			50.00%
2022 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)		1
Purchase Price | $		$ 32,000
2022 Acquisitions | Maryland Asset February 2022
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)		1
Purchase Price | $		$ 32,000
2021 Dispositions
STORAGE FACILITIES
Number of Facilities, dispositions (in properties)			5
Sale Price | $			$ 43,800
2021 Dispositions | Colorado and Nevada Assets September 2021
STORAGE FACILITIES
Number of Facilities, dispositions (in properties)			2
Sale Price | $			$ 16,900
2021 Dispositions | North Carolina Assets September 2021
STORAGE FACILITIES
Number of Facilities, dispositions (in properties)			2
Purchase Price | $			$ 21,700
2021 Dispositions | Texas Asset November 2021
STORAGE FACILITIES
Number of Facilities, dispositions (in properties)			1
Purchase Price | $			$ 5,200
LAACO | 2021 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)	57		57
Outstanding partnership unit purchased (in shares) | shares	167,557		167,557
Partnership units (dollars per share) | $ / shares	$ 9,838		$ 9,838
Number of joint ventures | item	2		2
LAACO | 2021 Acquisitions | Acquisitions
STORAGE FACILITIES
Ownership interest held by the entity (as a percent)	50.00%

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