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Fair Value Measurements
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
FAIR VALUE MEASUREMENTS
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, various techniques and assumptions can be used to estimate fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement as follows:
Level 1 - Quoted prices in active markets for identical assets or liabilities.
Level 2 - Observable inputs other than quoted prices in active markets for similar assets and liabilities.
Level 3 - Inputs that are unobservable inputs for the asset or liability.

The Company had no financial assets or liabilities measured at fair value on a recurring basis at December 31, 2017 and 2016. The Company's only financial instrument for which carrying value differs from its fair value is long-term debt. At December 31, 2017 and 2016, the fair value of outstanding debt net of unamortized debt issuance costs was $213.8 million and $219.9 million, respectively, compared to its carrying value of $210.0 million and $209.6 million, respectively. The fair value of the Company's Senior Subordinated 6.25% Notes is classified as Level 2 within the fair value hierarchy and was estimated based on quoted market prices adjusted for unamortized debt issuance costs.
The Company’s other financial instruments primarily consist of cash and cash equivalents, accounts receivable, notes receivable, and accounts payable.  The carrying values for our financial instruments approximate fair value. The Company did not have any other material assets or liabilities carried at fair value and measured on a recurring basis as of December 31, 2017 and 2016.
Other non-recurring fair value measurements
The Company recognized the impairment of certain intangible assets and property, plant, and equipment during the years ended December 31, 2017, 2016 and 2015. The Company uses unobservable inputs, classified as Level 3 inputs, in determining the fair value of these assets. See Note 6 and Note 14 of the consolidated financial statements for more disclosure regarding the impairment of certain intangible assets and property, plant, and equipment, respectively.
The Company also applied fair value principles for the goodwill impairment tests performed during 2017, 2016, and 2015. The Company used two valuation models to estimate the fair values of its reporting units, both of which primarily use Level 3 inputs. See Note 6 of the consolidated financial statements for the results of the Company’s goodwill impairment tests.
Additionally, the Company's recent acquisition activity, as described in Note 5 of the consolidated financial statements, used Level 3 inputs to estimate fair values allocated to the assets acquired and liabilities assumed.