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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 6.25% senior notes due 2015 [Member] Level 2 [Member] | Sep. 30, 2012 7.731% senior subordinated notes due 2017 [Member] Level 2 [Member] | Dec. 31, 2011 7.731% senior subordinated notes due 2017 [Member] Level 2 [Member] | Sep. 30, 2012 7.15% senior notes due 2020 [Member] Level 2 [Member] | Dec. 31, 2011 7.15% senior notes due 2020 [Member] Level 2 [Member] | Apr. 30, 2012 7.00% senior notes due 2022 [Member] | Sep. 30, 2012 7.00% senior notes due 2022 [Member] Level 2 [Member] | Sep. 30, 2012 1.875% convertible senior notes due 2032 [Member] | Sep. 30, 2012 1.875% convertible senior notes due 2032 [Member] Level 2 [Member]
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Fair value of fixed-rate debt |  |  |  |  |  |  |  |  |
Aggregate Principal | $ 285,000 | $ 99,825 | $ 125,875 | $ 200,000 | $ 200,000 | $ 300,000 | $ 300,000 | $ 126,500 | $ 126,500
Estimated Fair Value | $ 278,588 | $ 102,820 | $ 110,770 | $ 215,760 | $ 190,000 |  | $ 321,000 |  | $ 124,919

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