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UNSECURED BANK CREDIT FACILITIES (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Integer
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]      
Unsecured bank credit facilities $ 124,194,000 $ 111,394,000  
Average bank borrowings $ 87,095,000 $ 172,175,000 $ 141,223,000
Weighted average interest rates (in hundredths) 1.86% 3.34% 2.64%
Amortization of facility fees $ 790,000 $ 790,000 $ 736,000
Amortization of bank loan costs 561,000 $ 556,000 $ 508,000
Bank credit facility obtained in 2018 - $350 million [Member] | Nine bank group unsecured revolving credit facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 350,000,000    
Debt instrument, spread above LIBOR variable rate (in basis points) 100    
Line of credit, facility fee (in basis points) 20    
Debt Instrument, Maturity Date, Description July 30, 2022    
Credit facility, extension option two six-month extensions    
Banks included in the unsecured revolving credit facility group | Integer 9    
Line of Credit Facility, Interest Rate at Period End 1.152%    
Unsecured bank credit facilities - variable rate, carrying amount $ 125,000,000    
Letters of Credit Outstanding, Amount 674,000    
Expansion option on credit facility 150,000,000    
Credit facility obtained in 2018 - $45 million [Member] | Pnc Na Unsecured revolving credit facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 45,000,000    
Debt instrument, spread above LIBOR variable rate (in basis points) 100    
Line of credit, facility fee (in basis points) 20    
Debt Instrument, Maturity Date, Description July 30, 2022    
Credit facility, extension option two six-month extensions    
Line of Credit Facility, Interest Rate at Period End 1.144%    
Unsecured bank credit facilities - variable rate, carrying amount $ 0