Supplemental Financial Information (Narrative) (Details) (Senior Subordinated 6.25% Notes, Due December 1, 2021 [Member])	9 Months Ended
Sep. 30, 2013
Senior Subordinated 6.25% Notes, Due December 1, 2021 [Member]
Schedule Of Supplemental Financial Information [Line Items]
Senior Subordinated Notes, interest rate	6.25%
Senior Subordinated Notes, maturity date	Feb. 01, 2021

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration