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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mortgage loans and Notes payable    
Less: Loan procurement costs, net $ (1,592) $ (2,150)
Total mortgage loans and notes payable 111,434 114,618
Net book value of self-storage facilities 3,408,790 3,326,816
Mortgages    
Mortgage loans and Notes payable    
Carrying value 108,796 111,586
Plus: Unamortized fair value adjustment 3,286 3,742
Less: Loan procurement costs, net (648) (710)
Total mortgage loans and notes payable 111,434 114,618
Net book value of self-storage facilities used to secure debt $ 236,900 233,100
YSI 67    
Mortgage loans and Notes payable    
Carrying value   6,216
Effective interest rate (as a percent) 2.55%  
YSI 33    
Mortgage loans and Notes payable    
Carrying value $ 9,547 9,860
Effective interest rate (as a percent) 6.42%  
YSI 26    
Mortgage loans and Notes payable    
Carrying value $ 8,228 8,423
Effective interest rate (as a percent) 4.56%  
YSI 57    
Mortgage loans and Notes payable    
Carrying value $ 2,889 2,957
Effective interest rate (as a percent) 4.61%  
YSI 55    
Mortgage loans and Notes payable    
Carrying value $ 22,508 22,952
Effective interest rate (as a percent) 4.85%  
YSI 24    
Mortgage loans and Notes payable    
Carrying value $ 25,700 26,464
Effective interest rate (as a percent) 4.64%  
YSI 65    
Mortgage loans and Notes payable    
Carrying value $ 2,411 2,457
Effective interest rate (as a percent) 3.85%  
YSI 66    
Mortgage loans and Notes payable    
Carrying value $ 31,727 $ 32,257
Effective interest rate (as a percent) 3.51%  
YSI 68    
Mortgage loans and Notes payable    
Carrying value $ 5,786  
Effective interest rate (as a percent) 3.78%