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STORAGE PROPERTIES - Activity (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) facility	Dec. 31, 2020 USD ($) property
2021 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	2
Purchase Price	$ 34,075
2021 Acquisitions | Minnesota Asset April 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 12,000
2021 Acquisitions | Maryland Asset June 2021
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 22,075
2020 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)	21	13
Purchase Price	$ 735,875	$ 195,900
2020 Acquisitions | Texas Asset February 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 9,025
2020 Acquisitions | Maryland Asset April 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 17,200
2020 Acquisitions | New Jersey Asset April 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 48,450
2020 Acquisitions | Florida Asset November 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 3,900
2020 Acquisitions | Texas Asset, Austin, November 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 10,750
2020 Acquisitions | Texas Asset, Dallas, November 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 10,150
2020 Acquisitions | Nevada Asset December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 16,800
2020 Acquisitions | New York Asset December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 6,750
2020 Acquisitions | Storage Deluxe Assets December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	8
Purchase Price	$ 540,000
2020 Acquisitions | Florida Asset, Orlando, December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	3
Purchase Price	$ 45,500
2020 Acquisitions | Florida Assets, Tampa, December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 10,000
2020 Acquisitions | Virginia Asset December 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility	1
Purchase Price	$ 17,350
2020 Dispositions
STORAGE FACILITIES
Number of Facilities, dispositions (in properties) | facility	1
Sale Price	$ 12,750
2020 Dispositions | New York Asset December 2020
STORAGE FACILITIES
Number of Facilities, dispositions (in properties) | facility	1
Sale Price	$ 12,750

X

- Definition

Represents the number of real estate properties sold attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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