Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Operating Leases (Details)

v3.6.0.2
COMMITMENTS AND CONTINGENCIES - Operating Leases (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Other Commitments [Line Items]        
Number of self storage properties that are subject to non-cancelable leasehold interest agreements | property   4    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2017   $ 986    
2018   994    
2019   1,002    
2020   988    
2021   927    
2022 through 2055   25,477    
Total operating leases   30,374    
Ground Leases [Member]        
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2017   847    
2018   852    
2019   857    
2020   902    
2021   927    
2022 through 2055   25,477    
Total operating leases   29,862    
Office Building [Member]        
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2017   139    
2018   142    
2019   145    
2020   86    
2021   0    
2022 through 2055   0    
Total operating leases   512    
Property Operating Expenses [Member]        
Other Commitments [Line Items]        
Rent expense (less than $0.1 million in 2014)   1,100 $ 1,000 $ 100
Office Building [Member] | Greenwood Village, Colorado        
Other Commitments [Line Items]        
Additional term 5 years      
Office Building [Member] | Greenwood Village, Colorado | Property Operating Expenses [Member]        
Other Commitments [Line Items]        
Rent expense (less than $0.1 million in 2014)   $ 100 $ 100 $ 100