CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (6.875% Senior Notes, due 2019 [Member])	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
6.875% Senior Notes, due 2019 [Member]
Interest rate on notes (in hundredths)	6.875%	6.875%	6.875%
Debt Instrument, Maturity Date	2019	2019	2019

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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:stringItemType
Balance Type:	na
Period Type:	duration