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UNSECURED AND SECURED DEBT (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Secured and Unsecured Debt [Line Items] |  |  |  |
Unsecured debt, net of debt issuance costs |  | $ 1,242,570,000 | $ 1,107,708,000 |
Secured debt, carrying amount |  | 2,156,000 | 79,096,000 |
Carrying Amount of Securing Real Estate |  | 8,515,000 |  |
Unsecured debt, carrying amount |  | 1,245,000,000 | 1,110,000,000 |
Secured Debt |  | 2,142,000 | 78,993,000 |
Unsecured bank credit facilities, net of debt issuance costs |  | 207,066,000 | 124,194,000 |
Total debt |  | $ 1,451,778,000 | $ 1,310,895,000 |
Weighted average interest rates (in hundredths) |  | 1.01% | 1.86% | 3.34%
Repaid in 2021 - $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 | [1] | 2.34% |  |
Debt Instrument, Maturity Date | [1] | Jul. 30, 2021 |  |
Unsecured debt, carrying amount | [1] | $ 0 | $ 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 | [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 | [1] | 2.31% |  |
Debt Instrument, Maturity Date | [1] | Apr. 01, 2023 |  |
Unsecured debt, carrying amount | [1] | $ 65,000,000 | 65,000,000 |
Fifty million senior unsecured notes [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Effective interest rate |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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],[2] | 0.85% |  |
Effective interest rate | [1],[2] | 2.10% |  |
Debt Instrument, Maturity Date | [1],[2] | Oct. 10, 2026 |  |
Unsecured debt, carrying amount | [1],[2] | $ 100,000,000 | 100,000,000 |
Spread above LIBOR, before refinance |  | 1.50% |  |
Effective interest rate, before refinance |  | 2.75% |  |
Secured and unsecured debt [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2022 |  | $ 75,115,000 |  |
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 |  | 145,128,000 |  |
Long-term Debt, Maturities, Repayments of Principal in 2026 |  | $ 141,672,000 |  |
$100 million term loan (2020) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.45% |  |
Effective interest rate | [1] | 2.39% |  |
Debt Instrument, Maturity Date | [1] | Mar. 25, 2027 |  |
Unsecured debt, carrying amount | [1] | $ 100,000,000 | 100,000,000 |
$100 million senior unsecured private placement notes (2020) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Effective interest rate |  | 2.61% |  |
Debt Instrument, Maturity Date |  | Oct. 14, 2030 |  |
Unsecured debt, carrying amount |  | $ 100,000,000 | 100,000,000 |
$75 million senior unsecured private placement notes (2020) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Effective interest rate |  | 2.71% |  |
Debt Instrument, Maturity Date |  | Oct. 14, 2032 |  |
Unsecured debt, carrying amount |  | $ 75,000,000 | 75,000,000 |
$50 million unsecured term loan (2021) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.00% |  |
Effective interest rate | [1] | 1.55% |  |
Debt Instrument, Maturity Date | [1] | Mar. 18, 2025 |  |
Unsecured debt, carrying amount | [1] | $ 50,000,000 | 0 |
Debt Instrument, Term |  | 4 years |  |
$125 million senior unsecured private placement notes (2021) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Effective interest rate |  | 2.74% |  |
Debt Instrument, Maturity Date |  | Jun. 10, 2031 |  |
Unsecured debt, carrying amount |  | $ 125,000,000 | 0 |
Debt Instrument, Term |  | 10 years |  |
$100 million term loan (2021 refinance) |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Effective interest rate |  | 2.10% |  |
Unsecured debt, carrying amount |  | $ 100,000,000 |  |
Debt Instrument, Term |  | 5 years |  |
Sustainability-linked pricing component, interest margin reduction (in basis points) |  | 1 |  |
Spread over LIBOR, current interest rate (in basis points) |  | 85 |  |
Spread over LIBOR, reduction in interest rate (in basis points) |  | 65 |  |
Mortgage loan repaid in March 2021 - 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 |  | $ 0 | 41,610,000 |
Interest Rate (in hundredths) |  | 4.75% |  |
Monthly P & I Payment |  | $ 420,045 |  |
Maturity Date |  | Repaid |  |
Carrying Amount of Securing Real Estate |  | $ 0 |  |
Debt Instrument, Maturity Date |  | Jun. 05, 2021 |  |
Mortgage loan balance repaid |  | $ 40,800,000 |  |
Interest rate of mortgage loan repaid |  | 4.75% |  |
Mortgage loan repaid in October 2021 - 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 |  | $ 0 | 35,220,000 |
Interest Rate (in hundredths) |  | 4.09% |  |
Monthly P & I Payment |  | $ 329,796 |  |
Maturity Date |  | Repaid |  |
Carrying Amount of Securing Real Estate |  | $ 0 |  |
Debt Instrument, Maturity Date |  | Jan. 05, 2022 |  |
Mortgage loan balance repaid |  | $ 33,100,000 |  |
Interest rate of mortgage loan repaid |  | 4.09% |  |
Ramona Distribution Center [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Secured debt, carrying amount |  | $ 2,156,000 | 2,266,000 |
Interest Rate (in hundredths) |  | 3.85% |  |
Monthly P & I Payment |  | $ 16,287 |  |
Maturity Date |  | 11/30/2026 |  |
Carrying Amount of Securing Real Estate |  | $ 8,515,000 |  |
Notes Payable to Banks [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | 209,210,000 | 125,000,000 |
Unamortized debt issuance costs |  | 2,144,000 | 806,000 |
Unsecured bank credit facilities, net of debt issuance costs |  | 207,066,000 | 124,194,000 |
Unsecured Debt [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Unsecured debt, net of debt issuance costs |  | 1,242,570,000 | 1,107,708,000 |
Unsecured debt, carrying amount | [3] | 1,245,000,000 | 1,110,000,000 |
Unamortized debt issuance costs |  | 2,430,000 | 2,292,000 |
Secured Debt [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Secured debt, carrying amount | [3] | 2,156,000 | 79,096,000 |
Unamortized debt issuance costs |  | 14,000 | 103,000 |
Secured Debt |  | $ 2,142,000 | $ 78,993,000 |
[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 12) 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, 2021.
[2] | This term loan was refinanced during 2021. Effective October 10, 2021, the margin above LIBOR was reduced from 1.50% to 0.85% reducing the effectively fixed rate from 2.75% to 2.10%
[3] | These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.

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