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SIGNIFICANT ACCOUNTING POLICIES (Details) - joint_ventures | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Controlling interest Joint ventures [Abstract] |  |  |
Joint Ventures | 1 |  |
University Business Center 120 and 130 [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) |  | 80.00% | 80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests (in hundredths) |  | 100.00% | 100.00%
University Business Center [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) | 80.00% |  |
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests (in hundredths) | 100.00% |  |
University Business Center 125 and 175 [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Noncontrolling Interest, Ownership Percentage acquired during period |  |  | 20.00%
Tenant-in-common interest [Abstract] |  |  |
Ownership percentage |  | 100.00% | 100.00%
Castilian Research Center [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) | 80.00% |  |
Industry Distribution Center II - undivided tenant [Member] |  |  |
Tenant-in-common interest [Abstract] |  |  |
Equity method of accounting is used for undivided tenant-in-common interest in Industry Distribution Center II (in hundredths) | 50.00% | 50.00% | 50.00%

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