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PRINCIPLES OF CONSOLIDATION (Details) - joint_ventures | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsidiaries [Line Items] |  |  |  |
Joint Ventures | 1 | 1 |  |
University Business Center [Member] |  |  |  |
Subsidiaries [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage acquired during period |  |  | 20.00% |
Joint venture ownership interest |  |  | 80.00% | 80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests |  | 100.00% | 100.00% | 100.00%
University Business Center 120 and 130 [Member] |  |  |  |
Subsidiaries [Line Items] |  |  |  |
Joint venture ownership interest |  | 80.00% | 80.00% |
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests |  | 100.00% | 100.00% |
Castilian Research Center [Member] |  |  |  |
Subsidiaries [Line Items] |  |  |  |
Joint venture ownership interest |  |  |  | 80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests |  |  | 100.00% | 100.00%
Industry Distribution Center II - undivided tenant [Member] |  |  |  |
Subsidiaries [Line Items] |  |  |  |
Tenant-in-common interest |  | 50.00% | 50.00% | 50.00%

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- Definition Joint Ventures + References No definition available. + Details
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- Definition Records percentage of the joint ventures' assets, liabilities, revenues and expenses with non-controlling interests provided for in accordance with the joint venture agreement. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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