Long-Term Debt (Schedule of Early Redemption Prices on 7.125% Senior Notes) (Details) - Senior Notes at 7.125, Due 2020 [Member] - Senior Notes [Member]	12 Months Ended
Dec. 31, 2017
Debt Instrument, Redemption, Period Four [Member]
Debt Instrument, Redemption [Line Items]
Debt Instrument Redemption Price Percentage	101.781%
Debt Instrument, Redemption Period, Start Date	Jul. 15, 2017
Debt Instrument, Redemption Period, End Date	Jul. 14, 2018
Debt Instrument, Redemption, Period Five [Member]
Debt Instrument, Redemption [Line Items]
Debt Instrument Redemption Price Percentage	100.00%
Debt Instrument, Redemption Period, Start Date	Jul. 15, 2018
Debt Instrument, Redemption Period, End Date	Jul. 14, 2020

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

End date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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