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DEBT (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
Integer
Dec. 31, 2020
USD ($)
Loans Payable, Noncurrent [Abstract]    
Secured Debt $ 36,783,000 $ 78,993,000
Unsecured Debt 1,157,642,000 1,107,708,000
Unsecured bank credit facilities 91,638,000 124,194,000
Total debt 1,286,063,000 1,310,895,000
Secured and unsecured debt [Member]    
Payments of principal over future years [Abstract]    
Remainder of 2021 42,016,000  
2022 107,770,000  
2023 115,119,000  
2024 120,122,000  
2025 145,128,000  
2026 and beyond 666,673,000  
Long-term debt, maturities, secured debt and unsecured debt $ 1,196,828,000  
$50 million senior unsecured term loan (2021)    
Secured and Unsecured Debt [Line Items]    
Debt Instrument, Term 4 years  
Debt Instrument, Interest Rate, Effective Percentage 1.55%  
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Unsecured debt, carrying amount $ 50,000,000  
Mortgage loan, repaid during period    
Secured and Unsecured Debt [Line Items]    
Secured debt, carrying amount repaid $ 40,800,000  
Fixed interest rate 4.75%  
$125 million senior unsecured private placement notes (2021)    
Secured and Unsecured Debt [Line Items]    
Debt Instrument, Term 10 years  
Fixed interest rate 2.74%  
Unsecured debt, carrying amount $ 125,000,000  
Unsecured bank credit facilities    
Loans Payable, Noncurrent [Abstract]    
Unsecured bank credit facilities - variable rate, carrying amount 92,318,000 125,000,000
Unamortized debt issuance costs (680,000) (806,000)
Unsecured bank credit facilities 91,638,000 124,194,000
Unsecured Debt [Member]    
Secured and Unsecured Debt [Line Items]    
Unsecured debt, carrying amount [1] 1,160,000,000 1,110,000,000
Loans Payable, Noncurrent [Abstract]    
Unamortized debt issuance costs (2,358,000) (2,292,000)
Unsecured Debt 1,157,642,000 1,107,708,000
Secured Debt [Member]    
Loans Payable, Noncurrent [Abstract]    
Secured debt-fixed rate, carrying amount [1] 36,828,000 79,096,000
Unamortized debt issuance costs (45,000) (103,000)
Secured Debt $ 36,783,000 $ 78,993,000
Pnc Na Unsecured revolving credit facility [Member] | Credit facility obtained in 2018 - $45 million [Member]    
Secured and Unsecured Debt [Line Items]    
Line of Credit Facility, Interest Rate at Period End 1.111%  
Line of Credit Facility, Current Borrowing Capacity $ 45,000,000  
Debt instrument, basis spread above LIBOR variable rate 100  
Line of credit, facility fee (in basis points) 20  
Debt Instrument, Maturity Date, Description July 30, 2022  
Extension option on credit facility two six-month extensions  
Loans Payable, Noncurrent [Abstract]    
Unsecured bank credit facilities - variable rate, carrying amount $ 7,318,000  
Nine bank group unsecured revolving credit facility [Member] | Bank credit facility obtained in 2018 - $350 million [Member]    
Secured and Unsecured Debt [Line Items]    
Line of Credit Facility, Interest Rate at Period End 1.108%  
Letters of Credit Outstanding, Amount $ 674,000  
Line of Credit Facility, Current Borrowing Capacity $ 350,000,000  
Number of banks included in the unsecured revolving credit facility | Integer 9  
Debt instrument, basis spread above LIBOR variable rate 100  
Line of credit, facility fee (in basis points) 20  
Debt Instrument, Maturity Date, Description July 30, 2022  
Extension option on credit facility two six-month extensions  
Expansion option on credit facility $ 150,000,000  
Loans Payable, Noncurrent [Abstract]    
Unsecured bank credit facilities - variable rate, carrying amount $ 85,000,000  
[1] These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.