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Fair Value Measurements | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Measurements | Fair Value Measurements The Company is required to disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. The Company measures and discloses the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) "significant other observable inputs," and (iii) "significant unobservable inputs." "Significant other observable inputs" can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. "Significant unobservable inputs" are typically based on an entity’s own assumptions, since there is little, if any, related market activity. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers between the levels in the fair value hierarchy during the nine months ended September 30, 2018 and the year ended December 31, 2017. 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 |  | $ | — |
Financial instruments as of September 30, 2018 and December 31, 2017 consisted of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, other accrued expenses, and borrowings. With the exception of the mortgage loan in the table below, the amounts of the financial instruments presented in the consolidated financial statements substantially approximate their fair value as of September 30, 2018 and December 31, 2017. The fair value of the mortgage loan is estimated by discounting the loan’s principal balance over the remaining term of the mortgage using current borrowing rates available to the Company for debt instruments with similar terms and maturities. 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.
| Fair Value Measurements The Company is required to disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. The Company measures and discloses the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) “significant other observable inputs,” and (iii) “significant unobservable inputs.” “Significant other observable inputs” can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. “Significant unobservable inputs” are typically based on an entity’s own assumptions, since there is little, if any, related market activity. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers between the levels in the fair value hierarchy during the year ended December 31, 2017. 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 |  | $ | — |
Financial instruments as of December 31, 2017 consisted of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, other accrued expenses, and borrowings. With the exception of the mortgage loan in the table below, the amounts of the financial instruments presented in the consolidated financial statements substantially approximate their fair value as of December 31, 2017. The fair value of the mortgage loan is estimated by discounting the loan’s principal balance over the remaining term of the mortgage using current borrowing rates available to the Company for debt instruments with similar terms and maturities. 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] |  |
Fair Value Measurements | Fair Value Measurements The Company is required to disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. The Company measures and discloses the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) "significant other observable inputs," and (iii) "significant unobservable inputs." "Significant other observable inputs" can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. "Significant unobservable inputs" are typically based on an entity’s own assumptions, since there is little, if any, related market activity. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers between the levels in the fair value hierarchy during the nine months ended September 30, 2018 and the year ended December 31, 2017. 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 |  |  | $ | — |
Financial Instruments Disclosed at Fair Value Financial instruments as of September 30, 2018 and December 31, 2017 consisted of cash and cash equivalents, restricted cash, accounts receivable, accrued expenses and other liabilities, and mortgage payable and other borrowings, as defined in Note 5, Debt. With the exception of the mortgage loans in the table below, the amounts of the financial instruments presented in the consolidated financial statements substantially approximate their fair value as of September 30, 2018 and December 31, 2017. The fair value of the two mortgage loans in the table below is estimated by discounting each loan’s principal balance over the remaining term of the mortgage using current borrowing rates available to the Company for debt instruments with similar terms and maturities. 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.
| Fair Value Measurements The Company is required to disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. The Company measures and discloses the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) “significant other observable inputs,” and (iii) “significant unobservable inputs.” “Significant other observable inputs” can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. “Significant unobservable inputs” are typically based on an entity’s own assumptions, since there is little, if any, related market activity. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers between the levels in the fair value hierarchy during the years ended December 31, 2017 and 2016. 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 | ) |  | $ | — |
Financial Instruments Disclosed at Fair Value Financial instruments as of December 31, 2017 and 2016 consisted of cash and cash equivalents, restricted cash, accounts receivable, accrued expenses and other liabilities, and mortgage payable and other borrowings, as defined in Note 5, Debt. With the exception of the mortgage loans in the table below, the amounts of the financial instruments presented in the consolidated financial statements substantially approximate their fair value as of December 31, 2017 and 2016. The fair value of the three mortgage loans in the table below is estimated by discounting each loan’s principal balance over the remaining term of the mortgage using current borrowing rates available to the Company for debt instruments with similar terms and maturities. 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 The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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