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STORAGE PROPERTIES - Activity (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
property
facility
Dec. 31, 2016
USD ($)
facility
Dec. 31, 2015
USD ($)
facility
2017 Acquisitions      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 7    
Purchase Price $ 80,650    
2017 Acquisitions | Illinois Asset April 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 11,200    
2017 Acquisitions | Maryland Asset May 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 18,200    
2017 Acquisitions | California Asset May 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 3,650    
2017 Acquisitions | Texas Asset October 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 4,050    
2017 Acquisitions | Florida Asset October 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 14,500    
2017 Acquisitions | Illinois Asset November 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 11,300    
2017 Acquisitions | Florida Asset December 2017      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility 1    
Purchase Price $ 17,750    
2016 Acquisitions      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) 28 28  
Purchase Price   $ 403,550  
2016 Acquisitions | Metro DC Asset One      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 21,000  
2016 Acquisitions | Texas Asset Nineteen      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   2  
Purchase Price   $ 24,800  
2016 Acquisitions | New York Asset Four      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 48,500  
2016 Acquisitions | Texas Asset Twenty      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 11,600  
2016 Acquisitions | Connecticut Asset      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 19,000  
2016 Acquisitions | Texas Asset Twenty-one      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 11,600  
2016 Acquisitions | Florida Assets Thirteen      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   3  
Purchase Price   $ 47,925  
2016 Acquisitions | Colorado Asset Two      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 11,350  
2016 Acquisitions | Texas Asset Twenty-Two      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 11,600  
2016 Acquisitions | Texas Asset Twenty-Three      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 10,100  
2016 Acquisitions | Texas Asset Twenty-Four      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 10,800  
2016 Acquisitions | Illinois Asset Two      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 12,350  
2016 Acquisitions | Illinois Asset Three      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 16,000  
2016 Acquisitions | Massachusetts Asset Three      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 14,300  
2016 Acquisitions | Nevada Asset      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   2  
Purchase Price   $ 23,200  
2016 Acquisitions | Arizona Asset Seven      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 14,525  
2016 Acquisitions | Minnesota Asset      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 15,150  
2016 Acquisitions | Colorado Asset      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 15,600  
2016 Acquisitions | Texas Asset Twenty-Five      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 6,100  
2016 Acquisitions | Texas Asset Twenty Six      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 5,300  
2016 Acquisitions | Nevada Asset Two      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 13,250  
2016 Acquisitions | North Carolina Asset One      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 10,600  
2016 Acquisitions | Arizona Asset Eight      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 14,000  
2016 Acquisitions | Nevada Asset Three      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility   1  
Purchase Price   $ 14,900  
2015 Acquisitions      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     29
Purchase Price     $ 292,362
2015 Acquisitions | Texas Asset Seventeen      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 7,295
2015 Acquisitions | HSRE Assets Two      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     4
Purchase Price     $ 27,500
2015 Acquisitions | Arizona Asset Five      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 7,900
2015 Acquisitions | Tennessee Assets      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 6,575
2015 Acquisitions | Texas Asset Eighteen      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 15,795
2015 Acquisitions | Florida Assets Eleven      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 7,300
2015 Acquisitions | Arizona Asset Six      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 10,100
2015 Acquisitions | Florida Assets Twelve      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 10,500
2015 Acquisitions | Texas Asset Eight      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 14,200
2015 Acquisitions | Maryland Asset Three      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 17,000
2015 Acquisitions | Maryland Asset Four      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 19,200
2015 Acquisitions | New York/New Jersey Assets      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     2
Purchase Price     $ 24,823
2015 Acquisitions | New Jersey Assets      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     1
Purchase Price     $ 14,350
2015 Acquisitions | PSI Assets      
STORAGE FACILITIES      
Number of Facilities, acquisitions (in properties) | facility     12
Purchase Price     $ 109,824
Dispositions      
STORAGE FACILITIES      
Number of Facilities, dispositions (in properties) | facility     8
Sale Price     $ 37,800
Dispositions | Texas Asset One      
STORAGE FACILITIES      
Number of Facilities, dispositions (in properties) | facility     7
Sale Price     $ 28,000
Dispositions | Florida Asset One      
STORAGE FACILITIES      
Number of Facilities, dispositions (in properties) | facility     1
Sale Price     $ 9,800