Debt (4.875% Senior Notes) (Narrative) (Details) - Senior Notes [Member] - 4.875% Senior Notes [Member]	12 Months Ended
	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Debt instrument, principal amount (in dollars)	$ 400,000,000
Debt instrument, interest rate (percentage)	4.875%
Debt instrument, maturity date	Mar. 15, 2023
Debt instrument, interest payment terms	Interest on the 4.875% Senior Notes is payable on March 15 and September 15 of each year.
Debt instrument, guarantees	The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness.
Debt instrument, redemption description	The Company has the option to redeem all or a portion of the 4.875% Senior Notes at any time at the redemption prices set forth in the indenture that governs the 4.875% Senior Notes (the “4.875% Senior Notes Indenture”) plus accrued and unpaid interest, if any, to the redemption date.
Debt instrument, restrictive covenants	The 4.875% Senior Notes Indenture, among other things, generally limits the ability of the Company and certain of its subsidiaries, subject to certain exceptions, to (i) incur additional debt and issue preferred stock, (ii) create liens, (iii) pay dividends, acquire shares of capital stock, make payments on subordinated debt or make investments, (iv) place limitations on distributions from certain subsidiaries, (v) issue guarantees, (vi) issue or sell the capital stock of certain subsidiaries, (vii) sell assets, (viii) enter into transactions with affiliates and (ix) effect mergers. The 4.875% Senior Notes Indenture provides for customary events of default, as well as customary remedies upon an event of default, as defined in the 4.875% Senior Notes Indenture, including acceleration of repayment of outstanding amounts.
Plan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, percentage of principal that may be redeemed	100.00%