Long-Term Obligations Credit Facility (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
LOng-Term Obligations Disclosure [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 150.0
Line of Credit Facility, Expiration Date	Nov. 08, 2022
Line of Credit Accordion	$ 100.0
Debt Issuance Costs, Line of Credit Arrangements, Gross	$ 1.4
Debt Instrument, Interest Rate Terms	In general, borrowing under the Credit Facility (other than Swingline loans) bears interest, at our option, based on the Base Rate plus applicable margin or the London Interbank Offered Rate ("LIBOR") rate plus applicable margin, as defined below:
Line of Credit Facility, Collateral	Our obligations are secured by: (i) 100% of the equity interests of our guarantor subsidiaries; and (ii) all of the tangible and intangible personal property and assets related to us and our guarantor subsidiaries (including, without limitation, all accounts, equipment, inventory and other goods, all instruments, intellectual property and other general intangibles, deposit accounts, securities accounts and other investment property and cash), and (iii) all products, profits and proceeds of the foregoing. Notwithstanding the foregoing, the collateral shall not include certain excluded property
Line of Credit Facility, Covenant Terms	The Credit Facility contains certain financial covenants pertaining to Consolidated Fixed Charge Coverage and Consolidated Total Leverage Ratios. In addition, the Credit Facility has restrictions pertaining to limitations on debt, liens, negative pledges, loans, advances, acquisitions, other investments, dividends, distributions, redemptions, repurchases of equity interests, fundamental changes and asset sales and other dispositions, prepayments, redemptions and purchases of subordinated debt and other junior debt, transactions with affiliates, dividend and payment restrictions affecting subsidiaries, changes in line of business, fiscal year and accounting practices and amendment of organizational documents and junior debt documents.