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Fair Value Disclosures (Details Textual)
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Sep. 30, 2012
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Dec. 31, 2011
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6.25% senior notes due 2015 [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 6.25% | 6.25% |
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7.731% senior subordinated notes due 2017 [Member]
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| Fair Value Disclosures (Textual) [Abstract] | ||
| Debt instrument, stated rate | 7.731% | 7.731% |
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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% | |
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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% |