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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details)
$ in Thousands
12 Months Ended
May 30, 2019
USD ($)
May 29, 2019
USD ($)
Mar. 07, 2019
USD ($)
Mar. 28, 2018
USD ($)
Dec. 31, 2019
USD ($)
facility
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 17, 2013
Interests in Consolidated Real Estate Joint Ventures                
Percentage of the Variable Interest Entity sold 90.00%              
Assets         $ 4,029,545 $ 3,752,972    
Liabilities         2,160,121 1,980,704    
Interest rate (as a percent)               4.375%
Option to put ownership interest in the venture       $ 20,400        
Purchase Price         118,300      
Gain from sale of real estate         1,508 10,576    
Proceeds from sale of real estate, net         3,856 16,389    
Gain from sale of real estate, net         1,508 10,576    
Elimination of noncontrolling interest in subsidiaries due to acquisition         40,605   $ 9,033  
Noncontrolling interests in subsidiaries         7,990 6,771    
Reduction to additional paid in capital         7,376 925 $ 1,058  
VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         93,033      
Liabilities         19,186      
CS Valley Forge Village Storage LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         4,279      
Liabilities         856      
Shirlington Rd II LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         8,965      
Liabilities         339      
CS 2087 Hempstead Tpk LLC                
Interests in Consolidated Real Estate Joint Ventures                
Option to call ownership interest of another member           6,600    
Accretion liability           2,800    
CS 2087 Hempstead Tpk LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         12,538      
Liabilities         3,289      
CS SDP Newtonville LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         10,351      
Liabilities         3,827      
CS 1158 McDonald Ave LLC                
Interests in Consolidated Real Estate Joint Ventures                
Option to call ownership interest of another member           10,000    
Accretion liability           $ 9,700    
CS 1158 McDonald Ave LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         41,995      
Liabilities         10,713      
Shirlington Rd LLC                
Interests in Consolidated Real Estate Joint Ventures                
Elimination of noncontrolling interest in subsidiaries due to acquisition     $ 10,000          
Noncontrolling interests in subsidiaries     0          
Reduction to additional paid in capital     9,700          
Amount of debt repaid     $ 12,200          
Shirlington Rd LLC | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Assets         14,905      
Liabilities         $ 162      
VIE                
Interests in Consolidated Real Estate Joint Ventures                
Period of option to call ownership interest of another member         1 year      
Period of option to put ownership interest in venture         1 year      
VIE | VIE                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         6      
VIE | CS Valley Forge Village Storage LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         70.00%      
Amount of mortgage loan commitment         $ 12,400      
VIE | Shirlington Rd II LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         90.00%      
Percentage of interest acquired     10.00%          
Payment made for acquisition of interest in real estate ventures     $ 4,800          
VIE | CS 2087 Hempstead Tpk LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         51.00%      
Option to put ownership interest in the venture         $ 6,600      
VIE | CS SDP Newtonville LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         90.00%      
Carrying amount of mortgage loans         $ 3,100      
Amount of mortgage loan commitment         $ 12,100      
VIE | CS 1158 McDonald Ave LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         51.00%      
Option to put ownership interest in the venture         $ 10,000      
VIE | Shirlington Rd LLC                
Interests in Consolidated Real Estate Joint Ventures                
Number of self-storage facilities owned and operated | facility         1      
Ownership interest held by the entity (as a percent)         90.00%      
Percentage of interest acquired     10.00%          
CS SJM E 92nd Street LLC                
Interests in Consolidated Real Estate Joint Ventures                
Proceeds from sale of real estate, net $ 3,700              
Note receivable 1,000              
Amount of debt repaid 700 $ 1,700            
Increase (Decrease) Operating Lease Liability (13,400)              
Increase (decrease) in operating lease, right-of-use asset $ (14,600)