Quarterly report pursuant to Section 13 or 15(d)

DEBT FINANCING - Debt Summary (Details)

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DEBT FINANCING - Debt Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount $ 1,148,460 $ 954,991
Unamortized debt issuance costs and debt premium, net 1,329 3,106
Total debt $ 1,149,789 958,097
Line of Credit | Credit Facility | Revolving line of credit    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.49%  
Principal amount $ 80,125 88,500
Unsecured Debt | Credit Facility | Term loan A    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.91%  
Principal amount $ 235,000 235,000
Unsecured Debt | Credit Facility | Term loan B    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.94%  
Principal amount $ 155,000 155,000
Unsecured Debt | Credit Facility | Term loan C    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.71%  
Principal amount $ 105,000 105,000
Unsecured Debt | Credit Facility | Term loan D    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.79%  
Principal amount $ 125,000 0
Unsecured Debt | Term Loan Facility    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.95%  
Principal amount $ 175,000 100,000
Mortgages | Fixed Rate Mortgages    
Debt Instrument [Line Items]    
Effective interest rate (percent) 4.17%  
Principal amount $ 273,335 $ 271,491