Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

v3.20.4
RELATED PARTY TRANSACTIONS - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 01, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
property
Sep. 30, 2020
USD ($)
property
Jun. 30, 2020
USD ($)
property
Mar. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Sep. 30, 2019
USD ($)
property
Jun. 30, 2019
USD ($)
property
Mar. 31, 2019
USD ($)
property
Dec. 31, 2020
USD ($)
property
shares
Dec. 31, 2019
USD ($)
property
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
property
Related Party Transaction [Line Items]                          
Payroll and related costs reimbursed to the PROs by the Company                   $ 123,486 $ 110,347 $ 103,875  
Number of properties acquired | property   33 4 4 36 7 6 24 32 77 69    
Asset acquisition consideration   $ 260,508 $ 23,804 $ 36,247 $ 222,773 $ 32,163 $ 35,771 $ 185,335 $ 194,561 $ 543,332 $ 447,830    
Equity issued in acquisition   $ 20,747 $ 3,427 $ 5,842 $ 7,217 $ 2,005 $ 950 $ 15,515 $ 33,356 37,233 51,826    
Ownership interest in reinsurance company acquired (percent) 5.50%                        
Management | Participating Regional Operator (PRO)                          
Related Party Transaction [Line Items]                          
Number of properties acquired | property                         16
Reimbursement for difference between fair value and contractual value of mortgages assumed                         $ 5,200
Reimbursements received for interest payments                   1,000 1,300    
Reimbursements received for principal payments                   $ 1,000 $ 1,300    
Shares or units issued upon reimbursement of assumed mortgages (in units) | shares                   28,467 37,770    
Joint Venture | Asset acquired from 2016 Joint Venture                          
Related Party Transaction [Line Items]                          
Number of properties acquired | property                   1 1    
Asset acquisition consideration                     $ 4,100    
Supervisory and administrative fee agreement | Management | Participating Regional Operator (PRO)                          
Related Party Transaction [Line Items]                          
Supervisory and administrative fees paid to the PROs                   $ 16,400 20,000 16,900  
Supervisory and administrative fee agreement | Management | Participating Regional Operator (PRO) | Minimum                          
Related Party Transaction [Line Items]                          
Supervisory and administrative fee arrangement 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 arrangement 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                   $ 25,900 32,000 29,500  
Due diligence costs | Management | Participating Regional Operator (PRO)                          
Related Party Transaction [Line Items]                          
Due diligence expenses payable to the PROs                   $ 500 700 $ 400  
Issuance of units to affiliate of Personal Mini | Affiliated entity                          
Related Party Transaction [Line Items]                          
Value of co-investment in acquisition                     $ 400    
Issuance of units to affiliate of Personal Mini | Affiliated entity | Subordinated performance units                          
Related Party Transaction [Line Items]                          
Issuance of shares/units (in shares) | shares                     11,100    
Acquisition of interest in reinsurance company                          
Related Party Transaction [Line Items]                          
Equity interest in reinsurance company $ 500                        
Acquisition of interest in reinsurance company | Tenant reinsurance intangible                          
Related Party Transaction [Line Items]                          
Recognized fair value allocated to intangible assets $ 14,600                        
Weighted average remaining useful life (in years) 25 years                        
Acquisition of interest in reinsurance company | Ground Up                          
Related Party Transaction [Line Items]                          
Consideration in acquisition transaction $ 15,100                        
Cash paid in acquisition $ 6,600                        
Acquisition of interest in reinsurance company | Ground Up | OP units                          
Related Party Transaction [Line Items]                          
OP units issued in acquisition (in shares) | shares 285,512                        
Value of OP units issued in acquisition $ 8,500                        
Acquisition of interest in reinsurance company | Management | OP units                          
Related Party Transaction [Line Items]                          
Cash paid in acquisition $ 2,200                        
OP units issued in acquisition (in shares) | shares 95,170                        
Value of OP units issued in acquisition $ 2,800                        
Real Estate Purchase From Affiliate Of Executives | Affiliated entity                          
Related Party Transaction [Line Items]                          
Number of properties acquired | property                   1      
Asset acquisition consideration                   $ 7,500      
Real Estate Purchase From Affiliate Of Executives | Affiliated entity | Mr. Arlen Nordhagen | OP units                          
Related Party Transaction [Line Items]                          
Number of units issued in acquisition | shares                   58,376      
Equity issued in acquisition                   $ 1,500      
Real Estate Purchase From Affiliate Of Executives | Affiliated entity | Mr. David Cramer | OP units                          
Related Party Transaction [Line Items]                          
Number of units issued in acquisition | shares                   29,689      
Equity issued in acquisition                   $ 700      
Real Estate Purchase From Affiliate Of Trustee | Affiliated entity                          
Related Party Transaction [Line Items]                          
Number of properties acquired | property                   1      
Asset acquisition consideration                   $ 8,300      
Real Estate Purchase From Affiliate Of Trustee | Affiliated entity | Mr. J. Timothy Warren | OP units                          
Related Party Transaction [Line Items]                          
Number of units issued in acquisition | shares                   16,620      
Equity issued in acquisition                   $ 500