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REAL ESTATE PROPERTIES (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jan. 01, 2019 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Percentage of occupancy to qualify as value-add property |  |  |  | 75.00% |  |  |  |
Percentage of acquisition price to be spent on capital items to qualify as value-add property |  |  |  | 20.00% |  |  |  |
Depreciation Expense During the Period |  | $ 21,384,000 | $ 18,960,000 | $ 63,650,000 | $ 55,785,000 |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Land |  | 418,346,000 |  | 418,346,000 |  | $ 380,684,000 |  |
Building and building improvements |  | 1,847,038,000 |  | 1,847,038,000 |  | 1,732,592,000 |  |
Tenant and other improvements |  | 462,031,000 |  | 462,031,000 |  | 440,205,000 |  |
Right of use assets - Ground leases (operating) | [1] | 12,242,000 |  | 12,242,000 |  | 0 |  |
Development and value-add properties | [2] | 354,238,000 |  | 354,238,000 |  | 263,664,000 |  |
Real estate, development and value-add properties |  | 3,093,895,000 |  | 3,093,895,000 |  | 2,817,145,000 |  |
Less accumulated depreciation |  | (854,368,000) |  | (854,368,000) |  | (814,915,000) |  |
Real estate, net |  | 2,239,527,000 |  | $ 2,239,527,000 |  | 2,002,230,000 |  |
Ground Leases Disclosures [Abstract] |  |  |  |  |  |  |  |
Weighted Average term for ground leases |  |  |  | 44 years |  |  |  |
Leases terms minimum |  |  |  | 40 years |  |  |  |
Leases terms maximum |  |  |  | 50 years |  |  |  |
Renewal period option minimum |  |  |  | 15 years |  |  |  |
Renewal period option maximum |  |  |  | 35 years |  |  |  |
Payment increase interval minimum |  |  |  | 3 years |  |  |  |
Payment increase interval maximum |  |  |  | 10 years |  |  |  |
Incremental borrowing rate used in determining the present value of lease payments |  |  |  |  |  |  |  | 7.30%
Total ground lease expenditures for continuing and discontinued operations |  | 261,000 | $ 193,000 | $ 705,000 | $ 585,000 | 783,000 |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 242,000 |  | 242,000 |  | 791,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 970,000 |  | 970,000 |  | 791,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 970,000 |  | 970,000 |  | 791,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 970,000 |  | 970,000 |  | 791,000 |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 975,000 |  | 975,000 |  | 791,000 |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 39,914,000 |  | 39,914,000 |  | 30,751,000 |  |
Operating leases, future minimum payments due, total |  | 44,041,000 |  | 44,041,000 |  | $ 34,706,000 |  |
imputed interest related to right of use assets for ground leases | [3] | (31,538,000) |  | (31,538,000) |  |  |  |
Amortization, ground leases |  | (228,000) |  | (228,000) |  |  |  |
Ground Leases, Net |  | $ 12,275,000 |  | $ 12,275,000 |  |  |  |
Building [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 40 years |  |  |  |
Minimum [Member] | Improvements [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 3 years |  |  |  |
Maximum [Member] | Improvements [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 15 years |  |  |  |
FLORIDA |  |  |  |  |  |  |  |
Ground Leases Disclosures [Abstract] |  |  |  |  |  |  |  |
Properties subject to ground leases |  | 2 |  | 2 |  |  |  |
TEXAS |  |  |  |  |  |  |  |
Ground Leases Disclosures [Abstract] |  |  |  |  |  |  |  |
Properties subject to ground leases |  | 3 |  | 3 |  |  |  |
ARIZONA |  |  |  |  |  |  |  |
Ground Leases Disclosures [Abstract] |  |  |  |  |  |  |  |
Properties subject to ground leases |  | 1 |  | 1 |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Right of use assets - Ground leases (operating) |  |  |  |  |  |  |  | $ 10,226,000
Logistics Center 6 & 7 [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Right of use assets - Ground leases (operating) |  |  |  |  |  |  | $ 2,679,000 |
Ground Leases Disclosures [Abstract] |  |  |  |  |  |  |  |
Incremental borrowing rate used in determining the present value of lease payments |  |  |  |  |  |  | 8.00% |
[1] | See below and in Note 20 for information regarding the Company’s right of use assets for ground leases.
[2] | Value-add properties are defined as properties that are either acquired but not stabilized or can be converted to a higher and better use. Acquired properties meeting either of the following two conditions are considered value-add properties: (1) Less than 75% occupied as of the acquisition date (or will be less than 75% occupied within one year of acquisition date based on near term lease roll), or (2) 20% or greater of the acquisition cost will be spent to redevelop the property.
[3] | As the Company’s leases do not provide an implicit rate, in order to calculate the present value of the remaining ground lease payments, the Company used its incremental borrowing rate, adjusted for a number of factors, including the long-term nature of the ground leases, the Company’s estimated borrowing costs, and the estimated fair value of the underlying land, to determine the imputed interest for its ground leases. The Company elected to use the portfolio approach as all of its ground leases in place as of January 1, 2019, have similar characteristics and determined 7.3% as the appropriate rate as of January 1, 2019, for all leases in place at that time. For the ground lease acquired during April 2019, the Company used its incremental borrowing rate, adjusted for the factors discussed above, which was determined to be 8.0%.

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