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Fair Value Disclosures (Details Textual)
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Mar. 31, 2014
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Dec. 31, 2013
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4.50% senior notes due two thousand eighteen [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 4.50% | 4.50% |
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7.15% senior notes due 2020 [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 7.15% | 7.15% |
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7.00% senior notes due 2022 [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 7.00% | 7.00% |
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1.875% convertible senior notes due 2032 [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 1.875% | 1.875% |
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- Details
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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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