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Fair Value Disclosures (Details Textual)	Sep. 30, 2013
7.731% senior subordinated notes due 2017 [Member]
Fair Value Disclosures (Textual) [Abstract]
Debt instrument, stated rate	7.731%
4.50% senior notes due two thousand eighteen [Member]
Fair Value Disclosures (Textual) [Abstract]
Debt instrument, stated rate	4.50%
7.15% senior notes due 2020 [Member]
Fair Value Disclosures (Textual) [Abstract]
Debt instrument, stated rate	7.15%
7.00% senior notes due 2022 [Member]
Fair Value Disclosures (Textual) [Abstract]
Debt instrument, stated rate	7.00%
1.875% convertible senior notes due 2032 [Member]
Fair Value Disclosures (Textual) [Abstract]
Debt instrument, stated rate	1.875%

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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 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)(1))

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

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