Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)

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SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
May. 10, 2016
property
Mar. 31, 2016
USD ($)
property
Mar. 31, 2015
USD ($)
property
Business Acquisition [Line Items]      
Number of self storage properties acquired | property   17 6
Number of Businesses Acquired for which Pro Forma Financial Information is Not Available | property   2  
Estimated fair value of acquired self storage properties   $ 88,800  
Recognized fair value allocated to real estate   86,700  
Revenue from acquired properties since acquisition   1,100  
Operating income (loss) from acquired properties since acquisition   100  
Acquisition costs   $ 1,288 $ 599
Number of Businesses Acquired for which Pro Forma Financial Information is Available | property   15 5
Leases, Acquired-in-Place [Member]      
Business Acquisition [Line Items]      
Recognized fair value allocated to in-place leases   $ 2,100  
Participating Regional Operator [Member] | Affiliated Entity [Member]      
Business Acquisition [Line Items]      
Number of self storage properties acquired | property   4  
Estimated fair value of acquired self storage properties   $ 18,400  
Subsequent Event [Member] | Subsequent Acquisitions [Member]      
Business Acquisition [Line Items]      
Number of self storage properties acquired | property 22