Annual report pursuant to Section 13 and 15(d)

DEBT FINANCING - Debt Summary (Details)

v3.10.0.1
DEBT FINANCING - Debt Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount $ 1,277,638 $ 954,991
Unamortized debt issuance costs and debt premium, net 464 3,106
Total debt $ 1,278,102 958,097
Line of Credit [Member] | Credit Facility [Member] | Revolving line of credit [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.90%  
Principal amount $ 139,500 88,500
Unsecured Debt [Member] | Credit Facility [Member] | Term Loan A    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.91%  
Principal amount $ 235,000 235,000
Unsecured Debt [Member] | Credit Facility [Member] | Term Loan B    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.94%  
Principal amount $ 155,000 155,000
Unsecured Debt [Member] | Credit Facility [Member] | Term Loan C    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.71%  
Principal amount $ 105,000 105,000
Unsecured Debt [Member] | Credit Facility [Member] | Term Loan D    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.79%  
Principal amount $ 125,000 0
Unsecured Debt [Member] | 2023 Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 3.13%  
Principal amount $ 175,000 100,000
Unsecured Debt [Member] | 2028 Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 4.62%  
Principal amount $ 75,000 0
Mortgages [Member] | Fixed Rate Mortgages Payable [Member]    
Debt Instrument [Line Items]    
Effective interest rate (percent) 4.18%  
Principal amount $ 268,138 $ 271,491