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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

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In-place lease valuation above market.

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In place lease valuation above market accumulated amortization.

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In place lease valuation above market net.

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In place lease valuation below market.

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In place lease valuation below market accumulated amortization.

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In place lease valuation below market net.

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Schedule of in-place lease valuation.

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Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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Amount before amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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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.

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