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UNSECURED AND SECURED DEBT (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Integer | Dec. 31, 2017 USD ($)
Secured and Unsecured Debt [Line Items] |  |  |
Carrying Amount of Securing Real Estate |  | $ 233,857,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Unsecured debt, carrying amount |  | 725,000,000 | $ 715,000,000
Secured debt, carrying amount |  | 189,038,000 | 200,354,000
Unsecured bank credit facilities |  | 193,926,000 | 195,709,000
Unsecured debt |  | 723,400,000 | 713,061,000
Secured debt |  | 188,461,000 | 199,512,000
Total debt |  | 1,105,787,000 | 1,108,282,000
Secured and unsecured debt [Member] |  |  |
Payments of principal over the next five years [Abstract] |  |  |
2019 |  | 130,567,000 |
2020 |  | 114,096,000 |
2021 |  | 129,563,000 |
2022 |  | 107,769,000 |
2023 |  | $ 115,119,000 |
$50 Million Unsecured Term Loan [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) |  | 3.91% |
Debt Instrument, Maturity Date |  | Dec. 21, 2018 |
Unsecured debt, carrying amount |  | $ 0 | 50,000,000
Unsecured debt, amount repaid during period |  | $ 50,000,000 |
Seventy-Five Million Unsecured Term Loan (closed in 2014) [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.15% |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) | [1] | 2.846% |
Debt Instrument, Maturity Date | [1] | Jul. 31, 2019 |
Unsecured debt, carrying amount | [1] | $ 75,000,000 | 75,000,000
$75 Million Unsecured Term Loan [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.10% |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) | [1] | 3.452% |
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] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.10% |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) | [1] | 2.335% |
Debt Instrument, Maturity Date | [1] | Jul. 30, 2021 |
Unsecured debt, carrying amount | [1] | $ 40,000,000 | 40,000,000
Seventy-Five Million Unsecured Term Loan executed in 2015 [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.40% |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) | [1] | 3.031% |
Debt Instrument, Maturity Date | [1] | Feb. 28, 2022 |
Unsecured debt, carrying amount | [1] | $ 75,000,000 | 75,000,000
Sixty-five million term loan (2016) [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate | [1] | 1.10% |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) | [1] | 2.313% |
Debt Instrument, Maturity Date | [1] | Apr. 01, 2023 |
Unsecured debt, carrying amount | [1] | $ 65,000,000 | 65,000,000
Spread over LIBOR, reduction in interest rate (in basis points) | Integer |  | 55 |
Thirty million senior unsecured notes [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
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] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Effective interest rate (in hundredths) |  | 3.93% |
Debt Instrument, Maturity Date |  | Apr. 10, 2028 |
Unsecured debt, carrying amount |  | $ 60,000,000 | 0
Long-term Debt, Maturities, Repayment Terms |  | 10 |
Dominguez, Industry I and III, Kingsview, Shaw, Walnut and Washington [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Interest Rate (in hundredths) |  | 7.50% |
Monthly P & I Payment |  | $ 539,747 |
Maturity Date |  | 5/5/2019 |
Carrying Amount of Securing Real Estate |  | $ 45,420,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt |  | $ 46,725,000 | 49,580,000
Blue Heron Distribution Center II [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Interest Rate (in hundredths) |  | 5.39% |
Monthly P & I Payment |  | $ 16,176 |
Maturity Date |  | 2/29/2020 |
Carrying Amount of Securing Real Estate |  | $ 4,555,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt |  | $ 233,000 | 409,000
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] |  |  |
Interest Rate (in hundredths) |  | 4.39% |
Monthly P & I Payment |  | $ 463,778 |
Maturity Date |  | 1/5/2021 |
Carrying Amount of Securing Real Estate |  | $ 66,493,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt |  | $ 52,115,000 | 55,317,000
Colorado Crossing, Interstate I-III, Rojas, Steele Creek 1 & 2, Venture and World Houston 3-9 |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Interest Rate (in hundredths) | [2] | 4.75% |
Monthly P & I Payment | [2] | $ 420,045 |
Maturity Date | [2] | 6/5/2021 |
Carrying Amount of Securing Real Estate | [2] | $ 53,820,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt | [2] | $ 47,445,000 | 50,161,000
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] |  |  |
Interest Rate (in hundredths) |  | 4.09% |
Monthly P & I Payment |  | $ 329,796 |
Maturity Date |  | 1/5/2022 |
Carrying Amount of Securing Real Estate |  | $ 54,679,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt |  | $ 40,046,000 | 42,315,000
Ramona Distribution Center [Member] |  |  |
Secured and Unsecured Debt [Line Items] |  |  |
Interest Rate (in hundredths) |  | 3.85% |
Monthly P & I Payment |  | $ 16,287 |
Maturity Date |  | 11/30/2026 |
Carrying Amount of Securing Real Estate |  | $ 8,890,000 |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt |  | 2,474,000 | 2,572,000
Notes Payable to Banks [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | 195,730,000 | 116,339,000
Unsecured bank credit facilities - fixed rate, carrying amount | [3],[4] | 0 | 80,000,000
Unamortized debt issuance costs |  | (1,804,000) | (630,000)
Unsecured bank credit facilities |  | 193,926,000 | 195,709,000
Unsecured Debt [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Unsecured debt, carrying amount | [4] | 725,000,000 | 715,000,000
Unamortized debt issuance costs |  | (1,600,000) | (1,939,000)
Unsecured debt |  | 723,400,000 | 713,061,000
Secured Debt [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Secured debt, carrying amount | [4] | 189,038,000 | 200,354,000
Unamortized debt issuance costs |  | (577,000) | (842,000)
Secured debt |  | 188,461,000 | $ 199,512,000
Nine bank group unsecured revolving credit facility [Member] | $80 million interest rate swap [Member] |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |
Unsecured bank credit facilities |  | $ 80,000,000 |
Line of Credit Facility, Interest Rate at Period End |  | 2.02% |
Debt Instrument, Maturity Date, Description |  | 8/15/2018 |
[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, 2018.
[2] | Subsequent to December 31, 2018, the Company executed a collateral release for World Houston 5; this property is no longer considered to be collateral securing this loan.
[3] | The Company had designated an interest rate swap to an $80 million unsecured bank credit facility draw that effectively fixed the interest rate on the $80 million draw to 2.020% through the interest rate swap's maturity date. This swap matured on August 15, 2018, and the $80 million draw has reverted to the variable interest rate associated with the Company's unsecured bank credit facilities
[4] | These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.

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