Annual report pursuant to Section 13 and 15(d)

DEBT FINANCING - Debt Summary (Details)

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DEBT FINANCING - Debt Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Apr. 24, 2019
Jun. 05, 2018
Debt Instrument [Line Items]        
Principal amount $ 2,948,944 $ 1,922,614    
Unamortized debt issuance costs and debt premium, net (8,013) (5,643)    
Total debt $ 2,940,931 1,916,971    
Revolving line of credit | Revolving line of credit | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 1.35%      
Principal amount $ 490,000 174,000    
Unsecured debt | 2023 Term loan facility        
Debt Instrument [Line Items]        
Interest rate (percent) 2.83%      
Principal amount $ 175,000 175,000   $ 175,000
Unsecured debt | 2028 Term loan facility        
Debt Instrument [Line Items]        
Interest rate (percent) 4.62%      
Principal amount $ 75,000 75,000    
Unsecured debt | 2029 Term loan facility        
Debt Instrument [Line Items]        
Interest rate (percent) 4.27%   4.27%  
Principal amount $ 100,000 100,000    
Unsecured debt | 2026 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 2.16%      
Principal amount $ 35,000 0    
Unsecured debt | 2029 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 3.98%      
Principal amount $ 100,000 100,000    
Unsecured debt | August 2030 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 2.99%      
Principal amount $ 150,000 150,000    
Unsecured debt | November 2030 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 2.72%      
Principal amount $ 75,000 0    
Unsecured debt | May 2031 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 3.00%      
Principal amount $ 90,000 0    
Unsecured debt | August 2031 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 4.08%      
Principal amount $ 50,000 50,000    
Unsecured debt | November 2031 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 2.81%      
Principal amount $ 175,000 0    
Unsecured debt | 2032 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 3.09%      
Principal amount $ 100,000 100,000    
Unsecured debt | May 2033 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 3.10%      
Principal amount $ 55,000 0    
Unsecured debt | 2036 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 3.06%      
Principal amount $ 75,000 0    
Unsecured debt | Term loan A | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 3.69%      
Principal amount $ 125,000 125,000    
Unsecured debt | Term loan B | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 2.86%      
Principal amount $ 250,000 250,000    
Unsecured debt | Term loan C | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 2.86%      
Principal amount $ 225,000 225,000    
Unsecured debt | Term loan D | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 3.07%      
Principal amount $ 175,000 175,000    
Unsecured debt | Term loan E | Credit Facility        
Debt Instrument [Line Items]        
Interest rate (percent) 1.25%      
Principal amount $ 125,000 0    
Fixed rate mortgages payable | Fixed rate mortgages payable        
Debt Instrument [Line Items]        
Interest rate (percent) 3.82%      
Principal amount $ 303,944 $ 223,614