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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 13. Fair Value Measurements The Company uses a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. At December 31, 2017 and 2016, the Company held certain assets that are required to be measured at fair value on a recurring basis. These included investments held in connection with the Company’s non-qualified contributory deferred compensation plan. These investments consist of money market and mutual funds traded in an active market. The Company determined the fair value of these assets based on the net asset value per unit of the funds or the portfolio, which is based upon quoted market prices in an active market. Therefore, the Company has categorized these investments as Level 1. The Company has consistently applied these valuation techniques in all periods presented and believes it has obtained the most accurate information available for the types of instruments it holds. The Company had no liabilities required to be measured at fair value at December 31, 2017 and December 31, 2016. The Company’s assets measured at fair value on a recurring basis at December 31, were as follows (in thousands):
|  | December 31, 2017 |  |  | Markets for Identical Assets (Level 1) |  |  | Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |
Deferred compensation plan investments |  | $ | 25,055 |  |  | $ | 25,055 |  |  | $ | — |  |  | $ | — |
Total assets measured at fair value |  | $ | 25,055 |  |  | $ | 25,055 |  |  | $ | — |  |  | $ | — |
|  | December 31, 2016 |  |  | Markets for Identical Assets (Level 1) |  |  | Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |
Deferred compensation plan investments |  | $ | 22,204 |  |  | $ | 22,204 |  |  | $ | — |  |  | $ | — |
Total assets measured at fair value |  | $ | 22,204 |  |  | $ | 22,204 |  |  | $ | — |  |  | $ | — |
The remainder of the assets and liabilities held by the Company at December 31, 2017 are not required to be measured at fair value, and the carrying value of these assets and liabilities approximates fair value.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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