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Fair Value Disclosures (Details Textual) - Senior Notes [Member] | Jun. 30, 2015 | Jun. 02, 2015 | Dec. 31, 2014
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4.50% senior notes due 2018 [Member] |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |
Debt instrument, stated rate (percent) | 4.50% |  | 4.50%
7.15% senior notes due 2020 [Member] |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |
Debt instrument, stated rate (percent) | 7.15% |  | 7.15%
7.00% senior notes due 2022 [Member] |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |
Debt instrument, stated rate (percent) | 7.00% |  | 7.00%
6.00% senior notes due 2025 [Member] |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |
Debt instrument, stated rate (percent) | 6.00% | 6.00% |
1.875% convertible senior notes due 2032 [Member] |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |
Debt instrument, stated rate (percent) | 1.875% |  | 1.875%

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- Definition Fair value disclosures. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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