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Fair Value Disclosures (Details Textual) | Dec. 31, 2012 | Dec. 31, 2011
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6.25% senior notes due 2015 [Member] |  |
Fair Value Disclosures (Textual) [Abstract] |  |
Debt instrument, stated rate |  | 6.25%
7.731% senior subordinated notes due 2017 [Member] |  |
Fair Value Disclosures (Textual) [Abstract] |  |
Debt instrument, stated rate | 7.731% | 7.731%
7.15% senior notes due 2020 [Member] |  |
Fair Value Disclosures (Textual) [Abstract] |  |
Debt instrument, stated rate | 7.15% | 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 Interest rate stated in the contractual 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 + Details
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