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UNSECURED AND SECURED DEBT (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Secured and Unsecured Debt [Line Items] |  |  |
Unsecured debt |  | $ 938,115,000 | $ 723,400,000
Secured debt, carrying amount |  | 133,422,000 | 189,038,000
Carrying Amount of Securing Real Estate |  | $ 178,757,000 |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 4.27% |
Unsecured debt, carrying amount |  | $ 940,000,000 | 725,000,000
Secured Debt |  | 133,093,000 | 188,461,000
Unsecured bank credit facilities |  | 111,394,000 | 193,926,000
Total debt |  | $ 1,182,602,000 | 1,105,787,000
$75 million unsecured term loan (repaid in 2019) [Member] |  |  |
Unsecured Debt |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.15% |
Effective interest rate (in hundredths) | [1] | 2.85% |
Debt Instrument, Maturity Date | [1] | Jul. 31, 2019 |
Unsecured debt, carrying amount | [1] | $ 0 | 75,000,000
Unsecured debt, amount repaid during period |  | $ 75,000,000 |
$75 million term loan (2013) [Member] |  |  |
Unsecured Debt |  |  |
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] | $ 75,000,000 | 75,000,000
$40 million term loan (2016) [Member] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 3.80% |
Debt Instrument, Maturity Date |  | Aug. 28, 2020 |
Unsecured debt, carrying amount |  | $ 30,000,000 | 30,000,000
Fifty million senior unsecured notes [Member] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
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] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 4.27% |
Debt Instrument, Maturity Date |  | Mar. 28, 2029 |
Unsecured debt, carrying amount |  | $ 80,000,000 | 0
Debt Instrument, Term |  | 10 years |
$35 million senior unsecured private placement notes (2019) [Member] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 3.54% |
Debt Instrument, Maturity Date |  | Aug. 15, 2031 |
Unsecured debt, carrying amount |  | $ 35,000,000 | 0
$75 million senior unsecured private placement notes (2019) [Member] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 3.47% |
Debt Instrument, Maturity Date |  | Aug. 19, 2029 |
Unsecured debt, carrying amount |  | $ 75,000,000 | 0
$100 million term loan (2019) [Member] |  |  |
Unsecured Debt |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.50% |
Effective interest rate (in hundredths) | [1] | 2.75% |
Unsecured debt, amount obtained during period |  | $ 100,000,000 |
Debt Instrument, Maturity Date | [1] | Oct. 10, 2026 |
Unsecured debt, carrying amount | [1] | $ 100,000,000 | 0
Secured and unsecured debt [Member] |  |  |
Unsecured Debt |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2020 |  | 114,047,000 |
Long-term Debt, Maturities, Repayments of Principal in 2021 |  | 129,562,000 |
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 |
Dominguez, Industry I and III, Kingsview, Shaw, Walnut and Washington [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Secured debt, carrying amount |  | $ 0 | 46,725,000
Interest Rate (in hundredths) |  | 7.50% |
Monthly P & I Payment |  | $ 539,747 |
Loan status |  | Repaid |
Carrying Amount of Securing Real Estate |  | $ 0 |
Blue Heron Distribution Center II [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Secured debt, carrying amount |  | $ 0 | 233,000
Interest Rate (in hundredths) |  | 5.39% |
Monthly P & I Payment |  | $ 16,176 |
Loan status |  | Repaid |
Carrying Amount of Securing Real Estate |  | $ 0 |
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 |  | $ 48,772,000 | 52,115,000
Interest Rate (in hundredths) |  | 4.39% |
Monthly P & I Payment |  | $ 463,778 |
Maturity Date |  | Jan. 05, 2021 |
Carrying Amount of Securing Real Estate |  | $ 66,072,000 |
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] | $ 44,596,000 | 47,445,000
Interest Rate (in hundredths) | [2] | 4.75% |
Monthly P & I Payment | [2] | $ 420,045 |
Maturity Date | [2] | Jun. 05, 2021 |
Carrying Amount of Securing Real Estate | [2] | $ 50,002,000 |
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 |  | $ 37,682,000 | 40,046,000
Interest Rate (in hundredths) |  | 4.09% |
Monthly P & I Payment |  | $ 329,796 |
Maturity Date |  | Jan. 05, 2022 |
Carrying Amount of Securing Real Estate |  | $ 53,889,000 |
Ramona Distribution Center [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Secured debt, carrying amount |  | $ 2,372,000 | 2,474,000
Interest Rate (in hundredths) |  | 3.85% |
Monthly P & I Payment |  | $ 16,287 |
Maturity Date |  | Nov. 30, 2026 |
Carrying Amount of Securing Real Estate |  | $ 8,794,000 |
$75 million senior unsecured private placement notes (2019) [Member] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 3.47% |
Unsecured debt, carrying amount |  | $ 75,000,000 |
Debt Instrument, Term |  | 10 years |
$35 million senior unsecured private placement notes (2019) [Member] |  |  |
Unsecured Debt |  |  |
Effective interest rate (in hundredths) |  | 3.54% |
Unsecured debt, carrying amount |  | $ 35,000,000 |
Debt Instrument, Term |  | 12 years |
Notes Payable to Banks [Member] |  |  |
Unsecured Debt |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | $ 112,710,000 | 195,730,000
Unamortized debt issuance costs |  | 1,316,000 | 1,804,000
Unsecured bank credit facilities |  | 111,394,000 | 193,926,000
Unsecured Debt [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Unsecured debt |  | 938,115,000 | 723,400,000
Unsecured Debt |  |  |
Unsecured debt, carrying amount | [3] | 940,000,000 | 725,000,000
Unamortized debt issuance costs |  | 1,885,000 | 1,600,000
Secured Debt [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Secured debt, carrying amount | [3] | 133,422,000 | 189,038,000
Unsecured Debt |  |  |
Unamortized debt issuance costs |  | 329,000 | 577,000
Secured Debt |  | $ 133,093,000 | $ 188,461,000
$100 million term loan (2019) [Member] |  |  |
Unsecured Debt |  |  |
Debt Instrument, Term |  | 7 years |
[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, 2019.
[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.

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