Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value of a financial instrument is the amount at which the instrument could be exchanged in an orderly transaction between market participants to sell the asset or transfer the liability. The inputs used by the Company to measure fair value are classified into the following hierarchy: Level 1: Quoted prices in active markets for identical assets or liabilities. Level 2: Inputs other than quoted prices included in Level 1 that are observable for the asset or liability through corroboration with market data at the measurement date. Level 3: Unobservable inputs that reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. In determining the fair value of assets and liabilities that are measured on a recurring basis at September 30, 2014 and December 31, 2013, the Company utilized Level 2 inputs to perform such measurements methods, which were commensurate with the market approach. As of September 30, 2014 and December 31, 2013, the fair value of the supplemental executive and director retirement savings plan investments, which are included in prepaid and other current assets in the accompanying consolidated balance sheets, was $16.8 million and $13.3 million, respectively. The fair values were determined using the calculated net asset values obtained from the plan administrator and observable inputs of similar public mutual fund investments (Level 2). There were no transfers to or from Levels 1 and 2 during the three months ended September 30, 2014. Cash and cash equivalents, receivables and payables are reflected in the financial statements at cost, which approximates fair value. At September 30, 2014, the Company had $3.5 million of restricted marketable securities which are certificates of deposit with maturities less than 90 days which approximate fair value. The fair value of fixed rate long-term debt, with a carrying value of $1,378.7 million, was $1,362.0 million at September 30, 2014. The fair value of variable rate long-term debt approximates its carrying value of $870.0 million at September 30, 2014. With the exception of the Company’s 2020 and 2022 Senior Unsecured Notes, the fair value of fixed rate debt (Level 2) is determined based on an estimation of discounted future cash flows of the debt at rates currently quoted or offered to the Company for similar debt instruments of comparable maturities by its lenders. The fair value of the Company’s 2020 and 2022 Senior Unsecured Notes (Level 1) is determined based on quoted prices in an active market.

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.

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