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ASSETS HELD FOR SALE ASSETS HELD FOR SALE - Schedule for assets held for sale (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 building | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Sale price subject to prorations and adjustments |  | $ 24,400 | $ 24,400 |  |
Assets held for sale |  | 0 | 0 |  | $ 21,328
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Gross |  |  |  |  | 22,063
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Accumulated Depreciation, Depletion And Amortization |  |  |  |  | (1,278)
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Net |  |  |  |  | 20,785
Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Gross |  |  |  |  | 961
Accumulated Amortization |  | (66,648) | $ (66,648) |  | (38,941)
Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Net |  |  |  |  | 493
Number of reportable segments | segment |  |  | 1 |  |
Land |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 5,818
Building |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 14,984
Site improvements |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 950
Computer equipment and capitalized software |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 166
Furniture and other equipment |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 145
Tenant leases |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  |  |  | 961
Accumulated Amortization |  |  |  |  | $ (468)
Two Office Buildings In Charlotte, NC [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Number Of Office Buildings Acquired | building | 2 |  |  |  |
Fixed assets |  |  |  | $ 23,500 |
Acquisition Costs, Period Cost |  |  |  | $ 100 |
Discontinued Operations, Disposed of by Sale | Two Office Buildings In Charlotte, NC [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Closing Fee |  | 300 |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | $ 2,700 |  |  |

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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