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SUBSEQUENT EVENTS (Details) - 2015 Acquisitions $ in Thousands		6 Months Ended
	Jul. 01, 2015 USD ($) property	Jun. 30, 2015 USD ($) property
Subsequent Events
Number of self-storage facilities acquired (in properties)		11
Aggregate purchase or sale price | $		$ 92,965
Texas and Maryland Facilities | Subsequent event
Subsequent Events
Aggregate purchase or sale price | $	$ 50,400
Texas and Maryland Facilities | Subsequent event | Texas
Subsequent Events
Number of self-storage facilities acquired (in properties)	1
Texas and Maryland Facilities | Subsequent event | Maryland
Subsequent Events
Number of self-storage facilities acquired (in properties)	2

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