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Real Estate Real Estate - Amortization Income (Expense) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortization of above and below Market Leases | $ (3,511) | $ (3,389) | $ (4,573) | $ (3,592) | $ (1,858)
Amortization of Deferred Leasing Fees |  |  | 23,756 | 16,264 | 7,145
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |
Remaining 2018 | (386) |  |  |  |
Remaining 2018 | 11,150 |  |  |  |
Remaining 2018 | 21 |  |  |  |
Remaining 2018 | 2,389 |  |  |  |
2019 | (2,464) |  |  |  |
2019 | 38,096 |  |  |  |
2019 | 21 |  |  |  |
2019 | 4,765 |  |  |  |
2020 | (936) |  |  |  |
2020 | 29,867 |  |  |  |
2020 | 21 |  |  |  |
2020 | 4,712 |  |  |  |
2021 | (717) |  |  |  |
2021 | 25,170 |  |  |  |
2021 | 21 |  |  |  |
2021 | 4,830 |  |  |  |
2022 | (1,058) |  |  |  |
2022 | 22,938 |  |  |  |
2022 | 21 |  |  |  |
2022 | 4,818 |  |  |  |
Amortization of above and below Market Leases | $ (135) | $ 1,310 | 1,689 | 3,287 | (3,785)
Amortization of Deferred Leasing Fees |  |  | 59,046 | 72,912 | 69,099
Amortization Of Ground Leasehold Interest |  |  | 27 | 28 | 28
Amortization of Other Leasing Costs |  |  | $ 1,527 | $ 1,202 | $ 301

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- Definition Amortization of Ground Leasehold Interest + References No definition available. + Details
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- Definition Amortization of Above (Below) Market Leases, Remainder of Fiscal Year + References No definition available. + Details
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- Definition Amortization of Deferred Leasing Fee, Remainder of Fiscal Year + References No definition available. + Details
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- Definition Amortization of Deferred Leasing Fees, Year Five + References No definition available. + Details
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- Definition Amortization of Deferred Leasing Fees, Year Four + References No definition available. + Details
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- Definition Amortization of Deferred Leasing Fees, Year Three + References No definition available. + Details
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- Definition Amortization of Deferred Leasing Fees, Year Two + References No definition available. + Details
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- Definition Amortization of Ground Leasehold Interest, Year Five + References No definition available. + Details
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- Definition Amortization of Ground Leasehold Interest, Year Four + References No definition available. + Details
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- Definition Amortization of Ground Leasehold Interest, Year Three + References No definition available. + Details
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- Definition Amortization of Ground Leasehold Interests, Remainder of Fiscal Year + References No definition available. + Details
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- Definition Amortization of Other Leasing Cost, Remainder of Fiscal Year + References No definition available. + Details
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- Definition Amortization of Other Leasing Costs + References No definition available. + Details
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- Definition Amortization of Other Leasing Costs, Year Five + References No definition available. + Details
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- Definition Amortization of Other Leasing Costs, Year Four + References No definition available. + Details
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- Definition Amortization of Other Leasing Costs, Year Three + References No definition available. + Details
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- Definition Amortization of Other Leasing Costs, Year Two + References No definition available. + Details
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- Definition Amortization of above and below Market Leases, Year Five + References No definition available. + Details
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- Definition Amortization of above and below Market Leases, Year Four + References No definition available. + Details
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- Definition Amortization of above and below Market Leases, Year Three + References No definition available. + Details
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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: 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 + Details
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