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UNSECURED AND SECURED DEBT (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Secured and Unsecured Debt [Line Items]      
Unsecured debt $ 1,107,708,000 $ 938,115,000  
Secured debt, carrying amount 79,096,000 133,422,000  
Carrying Amount of Securing Real Estate 108,505,000    
Unsecured debt, carrying amount 1,110,000,000 940,000,000  
Secured Debt 78,993,000 133,093,000  
Unsecured bank credit facilities 124,194,000 111,394,000  
Total debt $ 1,310,895,000 $ 1,182,602,000  
Weighted average interest rates (in hundredths) 1.86% 3.34% 2.64%
$75 million term loan (2013) [Member]      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.10%    
Effective interest rate (in hundredths) [1] 3.45%    
Debt Instrument, Maturity Date [1] Dec. 20, 2020    
Unsecured debt, carrying amount [1] $ 0 $ 75,000,000  
Unsecured debt, amount repaid during period $ 75,000,000    
$40 million term loan (2016) [Member]      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.10%    
Effective interest rate (in hundredths) [1] 2.34%    
Debt Instrument, Maturity Date [1] Jul. 30, 2021    
Unsecured debt, carrying amount [1] $ 40,000,000 40,000,000  
$75 Million Unsecured Term Loan (2015) [Member]      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.40%    
Effective interest rate (in hundredths) [1] 3.03%    
Debt Instrument, Maturity Date [1] Feb. 28, 2022    
Unsecured debt, carrying amount [1] $ 75,000,000 75,000,000  
$65 million term loan (2016) [Member]      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.10%    
Effective interest rate (in hundredths) [1] 2.31%    
Debt Instrument, Maturity Date [1] Apr. 01, 2023    
Unsecured debt, carrying amount [1] $ 65,000,000 65,000,000  
Thirty million senior unsecured notes [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.80%    
Debt Instrument, Maturity Date Aug. 28, 2020    
Unsecured debt, carrying amount $ 0 30,000,000  
Principal repayment amount 30,000,000    
Unsecured debt, principal $ 100,000,000    
Fifty million senior unsecured notes [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.80%    
Debt Instrument, Maturity Date Aug. 28, 2023    
Unsecured debt, carrying amount $ 50,000,000 50,000,000  
Twenty million senior unsecured notes [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.80%    
Debt Instrument, Maturity Date Aug. 28, 2025    
Unsecured debt, carrying amount $ 20,000,000 20,000,000  
Sixty million senior unsecured notes (executed in 2017) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.46%    
Debt Instrument, Maturity Date Dec. 13, 2024    
Unsecured debt, carrying amount $ 60,000,000 60,000,000  
Sixty million senior unsecured notes (executed in 2016) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.48%    
Debt Instrument, Maturity Date Dec. 15, 2024    
Unsecured debt, carrying amount $ 60,000,000 60,000,000  
Forty million senior unsecured notes (executed in 2016) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.75%    
Debt Instrument, Maturity Date Dec. 15, 2026    
Unsecured debt, carrying amount $ 40,000,000 40,000,000  
Twenty-five million senior unsecured notes (executed in 2015) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.97%    
Debt Instrument, Maturity Date Oct. 01, 2025    
Unsecured debt, carrying amount $ 25,000,000 25,000,000  
Fifty million senior unsecured notes (executed in 2015) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.99%    
Debt Instrument, Maturity Date Oct. 07, 2025    
Unsecured debt, carrying amount $ 50,000,000 50,000,000  
Sixty million senior unsecured notes (executed in 2018) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.93%    
Debt Instrument, Maturity Date Apr. 10, 2028    
Unsecured debt, carrying amount $ 60,000,000 60,000,000  
$80 million senior unsecured private placement notes (2019) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 4.27%    
Debt Instrument, Maturity Date Mar. 28, 2029    
Unsecured debt, carrying amount $ 80,000,000 80,000,000  
$35 million senior unsecured private placement notes (2019) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.54%    
Debt Instrument, Maturity Date Aug. 15, 2031    
Unsecured debt, carrying amount $ 35,000,000 35,000,000  
$75 million senior unsecured private placement notes (2019) [Member]      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 3.47%    
Debt Instrument, Maturity Date Aug. 19, 2029    
Unsecured debt, carrying amount $ 75,000,000 75,000,000  
$100 million term loan (2019) [Member]      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.50%    
Effective interest rate (in hundredths) [1] 2.75%    
Debt Instrument, Maturity Date [1] Oct. 10, 2026    
Unsecured debt, carrying amount [1] $ 100,000,000 100,000,000  
Secured and unsecured debt [Member]      
Secured and Unsecured Debt [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in 2021 84,285,000    
Long-term Debt, Maturities, Repayments of Principal in 2022 107,770,000    
Long-term Debt, Maturities, Repayments of Principal in 2023 115,119,000    
Long-term Debt, Maturities, Repayments of Principal in 2024 120,122,000    
Long-term Debt, Maturities, Repayments of Principal in 2025 $ 95,128,000    
$100 million term loan (2020)      
Secured and Unsecured Debt [Line Items]      
Debt instrument, spread above LIBOR variable rate [1] 1.45%    
Effective interest rate (in hundredths) [1] 2.39%    
Debt Instrument, Maturity Date [1] Mar. 25, 2027    
Unsecured debt, carrying amount [1] $ 100,000,000 0  
Debt Instrument, Term 7 years    
$100 million senior unsecured private placement notes (2020)      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 2.61%    
Debt Instrument, Maturity Date Oct. 14, 2030    
Unsecured debt, carrying amount $ 100,000,000 0  
Debt Instrument, Term 10 years    
$75 million senior unsecured private placement notes (2020)      
Secured and Unsecured Debt [Line Items]      
Effective interest rate (in hundredths) 2.71%    
Debt Instrument, Maturity Date Oct. 14, 2032    
Unsecured debt, carrying amount $ 75,000,000 0  
Debt Instrument, Term 12 years    
Two senior unsecured private placement notes, totalling $175 million (2020) [Member]      
Secured and Unsecured Debt [Line Items]      
Unsecured debt, carrying amount $ 175,000,000    
Weighted average interest rates (in hundredths) 2.65%    
40th Avenue, Beltway Crossing V, Centennial Park, Executive Airport, Interchange Park I, Ocean View, Wetmore 5-8 and World Houston 26, 28, 29 and 30 [Member]      
Secured and Unsecured Debt [Line Items]      
Secured debt, carrying amount $ 0 48,772,000  
Interest Rate (in hundredths) 4.39%    
Monthly P & I Payment $ 463,778    
Maturity Date January 5, 2021    
Carrying Amount of Securing Real Estate $ 0    
Mort Loan Status Repaid    
Mortgage loan balance repaid $ 45,900,000    
Colorado Crossing, Interstate I-III, Rojas, Steele Creek 1 & 2, Venture and World Houston 3-9      
Secured and Unsecured Debt [Line Items]      
Secured debt, carrying amount [2] $ 41,610,000 44,596,000  
Interest Rate (in hundredths) [2] 4.75%    
Monthly P & I Payment [2] $ 420,045    
Maturity Date [2] 06/05/2021    
Carrying Amount of Securing Real Estate [2] $ 47,774,000    
Arion 18, Beltway VI & VII, Commerce Park II & III, Concord Distribution Center, Interstate Distribution Center V, VI & VII, Lakeview Business Center, Ridge Creek Distribution Center II, Southridge IV & V and World Houston 32 [Member]      
Secured and Unsecured Debt [Line Items]      
Secured debt, carrying amount $ 35,220,000 37,682,000  
Interest Rate (in hundredths) 4.09%    
Monthly P & I Payment $ 329,796    
Maturity Date 01/05/2022    
Carrying Amount of Securing Real Estate $ 52,034,000    
Ramona Distribution Center [Member]      
Secured and Unsecured Debt [Line Items]      
Secured debt, carrying amount $ 2,266,000 2,372,000  
Interest Rate (in hundredths) 3.85%    
Monthly P & I Payment $ 16,287    
Maturity Date 11/30/2026    
Carrying Amount of Securing Real Estate $ 8,697,000    
Notes Payable to Banks [Member]      
Secured and Unsecured Debt [Line Items]      
Unsecured bank credit facilities - variable rate, carrying amount 125,000,000 112,710,000  
Unamortized debt issuance costs 806,000 1,316,000  
Unsecured bank credit facilities 124,194,000 111,394,000  
Unsecured Debt [Member]      
Secured and Unsecured Debt [Line Items]      
Unsecured debt 1,107,708,000 938,115,000  
Unsecured debt, carrying amount [3] 1,110,000,000 940,000,000  
Unamortized debt issuance costs 2,292,000 1,885,000  
Secured Debt [Member]      
Secured and Unsecured Debt [Line Items]      
Secured debt, carrying amount [3] 79,096,000 133,422,000  
Unamortized debt issuance costs 103,000 329,000  
Secured Debt $ 78,993,000 $ 133,093,000  
[1] The interest rates on these unsecured term loans are comprised of LIBOR plus a margin which is subject to a pricing grid for changes in the Company's coverage ratings. The Company entered into interest rate swap agreements (further described in Note 13) to convert the loans' LIBOR rates to effectively fixed interest rates. The interest rates in the table above are the effectively fixed interest rates for the loans, including the effects of the interest rate swaps, as of December 31, 2020.
[2] During 2019, the Company executed a collateral release for World Houston 5; this property was sold during 2019 and is no longer considered to be collateral securing this loan.
[3] These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.