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Schedule III - Real Estate and Accumulated Depreciation Schedule III - Real Estate and Accumulated Depreciation - Rollforward of Accumulated Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2018
Real estate facilities |  |  |  |
Balance at beginning of year | $ 1,133,055 | $ 516,965 | $ 0 |
Acquisitions | 45,016 | 615,972 | 516,965 |
Improvements | 576 | 38 | 0 |
Construction-in-progress | 219 | 80 | 0 |
Balance at end of year | 1,178,866 | 1,133,055 | 516,965 |
Accumulated depreciation |  |  |  |
Balance at beginning of year | 39,955 | 12,061 | 0 |
Depreciation and amortization expense | 43,950 | 27,894 | 12,061 |
Balance at end of year | 83,905 | 39,955 | 12,061 |
Total real estate, net | 1,094,961 | 1,093,100 | 504,904 | $ 1,064,769
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |
Real estate facilities |  |  |  |
Balance at beginning of year | 3,024,389 | 2,968,982 | 1,823,895 |
Acquisitions | 133,747 | 42,438 | 1,087,153 |
Improvements | 12,479 | 16,792 | 7,382 |
Construction-in-progress | 1,752 | 575 | 45,067 |
Other adjustments | (2,785) | (4,398) | 0 |
Real estate assets held and used | 0 | 0 | 70,907 |
Write down of tenant origination and absorption costs | (2,352) | 0 | 0 |
Sale of real estate assets | (297,902) | 0 | (65,422) |
Balance at end of year | 2,869,328 | 3,024,389 | 2,968,982 |
Accumulated depreciation |  |  |  |
Balance at beginning of year | 338,552 | 208,933 | 102,883 |
Depreciation and amortization expense | 116,583 | 130,849 | 112,748 |
Depreciation expense (held and used adjustment) | 0 | 0 | 4,621 |
Less: Non-real estate assets depreciation expense | (1,554) | (1,230) | (328) |
Less: Sale of real estate assets depreciation expense | (26,829) | 0 | (10,991) |
Balance at end of year | 426,752 | 338,552 | 208,933 |
Total real estate, net | $ 2,439,795 | $ 2,685,837 | $ 2,760,049 | $ 2,564,832

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- Definition Schedule III, Real Estate and Accumulated Depreciation, Held for Use Assets Depreciation Expense Adjustment + References No definition available. + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of other deductions to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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