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STORAGE PROPERTIES - Activity (Details) $ in Thousands		3 Months Ended			12 Months Ended
	Jun. 06, 2019 property	Mar. 31, 2020 property	Mar. 31, 2020 facility	Mar. 31, 2020 USD ($)	Dec. 31, 2019 property	Dec. 31, 2019 facility	Dec. 31, 2019 USD ($)
STORAGE FACILITIES
Purchase Price							$ 118,300
HVP III
STORAGE FACILITIES
Number of self-storage facilities | property	18
HVP III
STORAGE FACILITIES
Percentage of interest acquired	90.00%
2020 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)		1	1
Purchase Price				$ 9,025
2020 Acquisitions | Texas Asset February 2020
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility			1
Purchase Price				$ 9,025
2019 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties)					11	29
Purchase Price							246,600
2019 Acquisitions | Maryland Asset March 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							22,000
2019 Acquisitions | Florida Assets April 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						2
Purchase Price							19,000
2019 Acquisitions | Arizona Asset May 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							1,550
2019 Acquisitions | HVP III Assets June 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						18
Purchase Price							128,250
2019 Acquisitions | Georgia Asset August 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							14,600
2019 Acquisitions | South Carolina Asset August 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							3,300
2019 Acquisitions | Texas Asset October 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							7,300
2019 Acquisitions | Florida Assets November 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						3
Purchase Price							32,100
2019 Acquisitions | California Asset December 2019
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | facility						1
Purchase Price							18,500
2019 Acquisitions | HVP III
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	18
Percentage of interest acquired	90.00%
2019 Dispositions
STORAGE FACILITIES
Number of Facilities, dispositions (in properties) | facility						1
Sale Price							4,146
2019 Dispositions | Texas Asset October 2019
STORAGE FACILITIES
Number of Facilities, dispositions (in properties) | facility						1
Sale Price							$ 4,146

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