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Fair Value Measurement
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurement
Fair Value Measurement
 
ASC 820, Fair Value Measurement, includes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on observable or unobservable inputs to valuation techniques that are used to measure fair value. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions.
 
The fair value hierarchy consists of the following three levels:
 
Level 1: Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2: Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs other than quoted prices that are observable and market-corroborated inputs, which are derived principally from or corroborated by observable market data.
Level 3: Inputs that are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The book value of the debt under the Credit Agreement, dated as of August 2, 2010, subsequently amended most recently as of February 3, 2017 and further discussed in Note 13, is considered to approximate its fair value as of March 31, 2018 as the interest rates are considered in line with current market rates. This valuation method utilizes Level 1 inputs.