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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of assets and liabilities measure at fair value on a recurring basis | The following tables set forth the assets that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of September 30, 2018:
| Total Fair Value | Quoted Prices in Active Markets for Identical Assets and Liabilities | Significant Other Observable Inputs | Significant Unobservable Inputs
Interest Rate Swaps at: |  |  |  |
September 30, 2018 | $ | 310 |  | $ | — |  | $ | 310 |  | $ | — |
December 31, 2017 | $ | 1,032 |  | $ | — |  | $ | 1,032 |  | $ | — |
| The following tables set forth the assets/(liabilities) that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2017 and 2016:
| Total Fair Value | Quoted Prices in Active Markets for Identical Assets and Liabilities | Significant Other Observable Inputs | Significant Unobservable Inputs
Interest Rate Swaps at: |  |  |  |
December 31, 2017 | $ | 1,032 |  | $ | — |  | $ | 1,032 |  | $ | — |
December 31, 2016 | $ | 996 |  | $ | — |  | $ | 996 |  | $ | — |
Schedule of carrying values and estimated fair values of financial instruments | The Company determined that the mortgage loan valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt, and there were no transfers into and out of fair value measurement levels during the nine months ended September 30, 2018 and for the year ended December 31, 2017.
| September 30, 2018 |  | December 31, 2017
| Fair Value |  | Carrying Value (1) |  | Fair Value |  | Carrying Value (1)
AIG Loan | $ | 119,338 |  |  | $ | 126,970 |  |  | $ | 122,928 |  |  | $ | 126,970 |
(1) | The carrying value of the AIG Loan does not include deferred financing costs as of September 30, 2018 and December 31, 2017. See Note 4, Debt, for details.
| The Company determined that the mortgage loan valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt, and there were no transfers into and out of fair value measurement levels during the years ended December 31, 2017 and 2016.
| December 31, 2017 |  | December 31, 2016
| Fair Value |  | Carrying Value (1) |  | Fair Value |  | Carrying Value (1)
AIG Loan | $ | 122,928 |  |  | $ | 126,970 |  |  | $ | 120,322 |  |  | $ | 126,970 |
(1) | The carrying value of the AIG Loan does not include deferred financing costs as of December 31, 2017 and 2016 . See Note 4, Debt, for details.
Griffin Capital Essential Asset REIT, Inc. [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of assets and liabilities measure at fair value on a recurring basis | The following tables set forth the assets that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of September 30, 2018 and December 31, 2017:
Assets/(Liabilities) |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets and Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
September 30, 2018 |  |  |  |  |  |  |  |
Interest Rate Swap Asset |  | $ | 10,892 |  |  | $ | — |  |  | $ | 10,892 |  |  | $ | — |
December 31, 2017 |  |  |  |  |  |  |  |
Interest Rate Swap Asset |  | $ | 3,713 |  |  | $ | — |  |  | $ | 3,713 |  |  | $ | — |
| The following tables set forth the assets and liabilities that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2017 and 2016:
Assets/(Liabilities) |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets and Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
December 31, 2017 |  |  |  |  |  |  |  |
Interest Rate Swap Asset |  | $ | 3,713 |  |  | $ | — |  |  | $ | 3,713 |  |  | $ | — |
December 31, 2016 |  |  |  |  |  |  |  |
Interest Rate Swap Liability |  | $ | (3,101 | ) |  | $ | — |  |  | $ | (3,101 | ) |  | $ | — |
Schedule of carrying values and estimated fair values of financial instruments | The Company determined that the mortgage debt valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt.
| September 30, 2018 |  | December 31, 2017
| Fair Value |  | Carrying Value (1) |  | Fair Value |  | Carrying Value (1)
Highway 94 loan | $ | 15,637 |  |  | $ | 16,714 |  |  | $ | 16,484 |  |  | $ | 17,352 |
BofA loan | $ | 361,602 |  |  | $ | 375,000 |  |  | $ | 377,289 |  |  | $ | 375,000 |
(1) | The carrying values do not include the debt premium/(discount) or deferred financing costs as of September 30, 2018 and December 31, 2017. See Note 5, Debt, for details.
| The Company determined that the mortgage debt valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt.
| December 31, 2017 |  | December 31, 2016
| Fair Value |  | Carrying Value (1) |  | Fair Value |  | Carrying Value (1)
AIG loan | $ | 113,715 |  |  | $ | 109,275 |  |  | $ | 113,052 |  |  | $ | 110,640 |
Highway 94 loan | 16,484 |  |  | 17,352 |  |  | 17,073 |  |  | 18,175 |
Samsonite loan | 23,851 |  |  | 22,961 |  |  | 24,349 |  |  | 23,786 |
(1) | The carrying values do not include the debt premium/(discount) or deferred financing costs as of December 31, 2017 and 2016. See Note 5, Debt, for details.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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