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SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Right of use assets - Office Leases (operating) | [1] | $ 2,115,000 | $ 0 |  |
Operating Lease, Right-of-Use Asset | [2] | 11,997,000 | 0 |  |
Indirect leasing costs |  | 411,000 | 0 | $ 0 |
Depreciation |  | $ 86,590,000 | $ 76,007,000 | $ 69,010,000 |
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 assets - Office Leases (operating) |  |  |  |  | $ 2,376,000
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 10,226,000
Right of use asset and lease liability for ground leases and office leases, estimated percentage of Total assets |  | less than 1% |  |  |
[1] | See Note 1(o) for information regarding the Company’s January 1, 2019, implementation of FASB ASC 842, Leases, and the Company’s right of use assets for office leases.
[2] | See Ground Leases discussion below and in Note 1(o) for information regarding the Company's right of use assets for ground leases.

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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