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SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 76,007,000 | $ 69,010,000 | $ 63,793,000
Percentage of Occupation When Development Cost Ceased Being Capitalized | 90.00% | 80.00% |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized | 1 year | 1 year |
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life (in years) | 40 years |  |
Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life (in years) | 3 years |  |
Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life (in years) | 15 years |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Right of use asset and lease liability for ground leases and office leases, estimated percentage of Total assets | less than 1% |  |
Lease costs that are expected to be expensed after adoption of new accounting standard | $ 200,000 |  |

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- Definition Lease costs that are expected to be expensed after adoption of new accounting standard + References No definition available. + Details
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- Definition Length of Time (in years) After Project Completion When Development Cost Ceased Being Capitalized + References No definition available. + Details
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- Definition Threshold percentage of occupation by tenants when the development cost on a property is no longer capitalized. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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