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Real Estate - Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Real Estate [Line Items] |  |  |
Below Market Lease, Gross | $ (62,070) | $ (62,070) | $ (61,069)
Below Market Lease, Accumulated Amortization | 14,564 | 10,775 | 5,750
Below Market Lease, Net | (47,506) | (51,295) | (55,319)
Finite-Lived Intangible Assets, Net | 175,100 | 193,199 |
Schedule of in-place lease valuation |  |  |
In-place lease valuation (above market) | 4,046 | 4,046 | 3,828
In-place lease valuation (above market) - accumulated amortization | (1,030) | (752) | (300)
In-place lease valuation (above market), net | 3,016 | 3,294 | 3,528
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |
Schedule of in-place lease valuation |  |  |
In-place lease valuation (above market) | 42,736 | 42,736 | 47,419
In-place lease valuation (above market) - accumulated amortization | (31,065) | (26,613) | (20,543)
In-place lease valuation (above market), net | 11,671 | 16,123 | 26,876
Ground leasehold interest (below market) | 2,254 | 2,255 | 2,254
Ground leasehold interest (below market) - accumulated amortization | (129) | (109) | (82)
Ground leasehold interest (below market), net | 2,125 | 2,146 | 2,172
Intangible assets, net | 13,796 | 18,269 | 29,048
In-place lease valuation (below market) | (55,482) | (49,774) | (51,966)
In-place lease valuation (below market) - accumulated amortization | 30,779 | 26,193 | 20,330
In-place lease valuation (below market), net | (24,703) | (23,581) | (31,636)
Tenant origination and absorption cost | 532,207 | 494,871 | 541,646
Tenant origination and absorption cost - accumulated amortization | (284,763) | (242,108) | (197,173)
Tenant origination and absorption cost, net | 247,444 | 252,763 | 344,473
Tenant origination and absorption costs |  |  |
Real Estate [Line Items] |  |  |
In-place lease valuation - above (below) market | 240,364 | 240,364 | 227,407
Finite-Lived Intangible Assets, Accumulated Amortization | $ (65,264) | (47,165) | (23,409)
Finite-Lived Intangible Assets, Net |  | $ 193,199 | $ 203,998

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- Definition Deferred Costs, Leasing, Gross, Including Related to Real Estate Held for Sale + References No definition available. + Details
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- Definition Finite-Lived Intangible Asset, Off-market Lease, Including Related to Real Estate Held for Sale + References No definition available. + Details
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- Definition In place lease valuation above market accumulated amortization. + References No definition available. + Details
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- Definition Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 + Details
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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 + Details
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