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Condensed Consolidating Financial Information (Narrative) (Details) - Parent	Jun. 30, 2018	Dec. 31, 2017	Mar. 28, 2016
Debt Instrument [Line Items]
Subsidiaries, Ownership Percentage			100.00%
Senior Notes | 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Senior Notes | 6.000% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Subsidiaries, Ownership Percentage	100.00%

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- Definition

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+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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