Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

v3.20.2
RELATED PARTY TRANSACTIONS (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
property
Mar. 31, 2020
USD ($)
property
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
property
shares
Jun. 30, 2019
USD ($)
Related Party Transaction [Line Items]          
Payroll and related costs reimbursed to the PROs by the Company $ 30,257   $ 27,190 $ 60,849 $ 53,647
Number of properties acquired | property 4 36   40  
Consideration in acquisition transaction $ 36,247 $ 222,773   $ 259,020  
Value of OP Equity 5,842 $ 7,217   13,059  
Supervisory and Administrative Fee Agreement | Management | Participating Regional Operator (PRO)          
Related Party Transaction [Line Items]          
Supervisory and administrative fees paid to the PROs 3,500   4,900 $ 8,800 9,600
Supervisory and Administrative Fee Agreement | Management | Participating Regional Operator (PRO) | Minimum          
Related Party Transaction [Line Items]          
Supervisory and administrative fee agreement of gross revenue, percent       5.00%  
Supervisory and Administrative Fee Agreement | Management | Participating Regional Operator (PRO) | Maximum          
Related Party Transaction [Line Items]          
Supervisory and administrative fee agreement of gross revenue, percent       6.00%  
Payroll Services | Management | Participating Regional Operator (PRO)          
Related Party Transaction [Line Items]          
Payroll and related costs reimbursed to the PROs by the Company 5,500   7,900 $ 14,300 15,700
Due Diligence Costs | Management | Participating Regional Operator (PRO)          
Related Party Transaction [Line Items]          
Due diligence expenses payable to the PROs $ 100   $ 300 $ 200 $ 600
Self storage property purchase from affiliate of executives | Affiliated entity          
Related Party Transaction [Line Items]          
Number of properties acquired | property       1  
Consideration in acquisition transaction       $ 7,500  
Self storage property purchase from affiliate of trustee | Affiliated entity          
Related Party Transaction [Line Items]          
Number of properties acquired | property       1  
Consideration in acquisition transaction       $ 6,600  
OP units | Self storage property purchase from affiliate of executives | Affiliated entity | Mr. Arlen Nordhagen          
Related Party Transaction [Line Items]          
Number of OP Units in acquisition (in shares) | shares       58,376  
Value of OP Equity       $ 1,500  
OP units | Self storage property purchase from affiliate of executives | Affiliated entity | Mr. David Cramer          
Related Party Transaction [Line Items]          
Number of OP Units in acquisition (in shares) | shares       29,689  
Value of OP Equity       $ 700  
OP units | Self storage property purchase from affiliate of trustee | Affiliated entity | Mr. J. Timothy Warren          
Related Party Transaction [Line Items]          
Number of OP Units in acquisition (in shares) | shares       15,512  
Value of OP Equity       $ 400