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Fair Value | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value | Fair Value We follow a three-tier fair value hierarchy, which classifies the inputs used in measuring fair values, in determining the fair value of our non-financial assets and non-financial liabilities, which consist primarily of goodwill. These tiers include: Level 1, defined as observable inputs such as quoted prices for identical instruments 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. There were no changes in the methods and assumptions used in measuring fair value during the period. At September 30, 2018, our financial instruments include cash and cash equivalents, receivables, payables and senior notes. The carrying amount of cash and cash equivalents, receivables and payables approximates fair value at September 30, 2018 and December 31, 2017, because of the short maturities of these instruments. The fair value of our senior notes is based on Level 1 inputs and was as follows at September 30, 2018 and December 31, 2017:
| September 30, 2018 |  | December 31, 2017
(in thousands) | Carrying Value |  | Fair Value |  | Difference |  | Carrying Value |  | Fair Value |  | Difference
6.625% senior notes | $ | 292,740 |  |  | $ | 291,276 |  |  | $ | (1,464 | ) |  | $ | 292,740 |  |  | $ | 278,835 |  |  | $ | (13,905 | )
4.75% senior notes | 250,000 |  |  | 252,950 |  |  | 2,950 |  |  | 250,000 |  |  | 237,500 |  |  | (12,500 | )
Total senior notes | $ | 542,740 |  |  | $ | 544,226 |  |  | $ | 1,486 |  |  | $ | 542,740 |  |  | $ | 516,335 |  |  | $ | (26,405 | )

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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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