Fair Value Disclosures (Details Textual) - Senior Notes [Member] |
Sep. 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 (percentage) | 4.50% | 4.50% | |
| 7.15% senior notes due 2020 [Member] | |||
| Fair Value Disclosures (Textual) [Abstract] | |||
| Debt instrument, stated rate (percentage) | 7.15% | 7.15% | |
| 7.00% senior notes due 2022 [Member] | |||
| Fair Value Disclosures (Textual) [Abstract] | |||
| Debt instrument, stated rate (percentage) | 7.00% | 7.00% | |
| 6.00% senior notes due 2025 [Member] | |||
| Fair Value Disclosures (Textual) [Abstract] | |||
| Debt instrument, stated rate (percentage) | 6.00% | 6.00% | |
| 1.875% convertible senior notes due 2032 [Member] | |||
| Fair Value Disclosures (Textual) [Abstract] | |||
| Debt instrument, stated rate (percentage) | 1.875% | 1.875% |
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- Definition Fair value disclosures. No definition available.
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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