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, 2019
Apr. 24, 2019
Dec. 31, 2018
Jun. 05, 2018
Debt Instrument [Line Items]        
Principal amount $ 1,539,260   $ 1,277,638  
Unamortized debt issuance costs and debt premium, net (5,213)   464  
Total debt $ 1,534,047   1,278,102  
Line of Credit | Credit Facility | Revolving line of credit        
Debt Instrument [Line Items]        
Effective interest rate (percent) 3.06%      
Principal amount $ 0   139,500  
Unsecured Debt | Credit Facility | Term Loan A        
Debt Instrument [Line Items]        
Effective interest rate (percent) 3.74%      
Principal amount $ 125,000   235,000  
Unsecured Debt | Credit Facility | Term Loan B        
Debt Instrument [Line Items]        
Effective interest rate (percent) 2.91%      
Principal amount $ 250,000   155,000  
Unsecured Debt | Credit Facility | Term Loan C        
Debt Instrument [Line Items]        
Effective interest rate (percent) 2.80%      
Principal amount $ 225,000   105,000  
Unsecured Debt | Credit Facility | Term Loan D        
Debt Instrument [Line Items]        
Effective interest rate (percent) 3.57%      
Principal amount $ 175,000   125,000  
Unsecured Debt | 2023 Term loan facility        
Debt Instrument [Line Items]        
Effective interest rate (percent) 2.83%      
Principal amount $ 175,000   175,000 $ 175,000
Unsecured Debt | 2028 Term loan facility        
Debt Instrument [Line Items]        
Effective interest rate (percent) 4.62%      
Principal amount $ 75,000   75,000  
Unsecured Debt | 2029 Term loan facility        
Debt Instrument [Line Items]        
Effective interest rate (percent) 4.27% 4.27%    
Principal amount $ 100,000   0  
Unsecured Debt | 2029 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Effective interest rate (percent) 3.98%      
Principal amount $ 100,000   0  
Unsecured Debt | 2031 Senior Unsecured Notes        
Debt Instrument [Line Items]        
Effective interest rate (percent) 4.08%      
Principal amount $ 50,000   0  
Mortgages | Fixed Rate Mortgages Payable        
Debt Instrument [Line Items]        
Effective interest rate (percent) 4.16%      
Principal amount $ 264,260   $ 268,138