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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 7.731% senior subordinated notes due 2017 [Member] Level 2 [Member] | Dec. 31, 2013 Senior Notes Due Two Thousand Eighteen [Member] [Domain] | Dec. 31, 2013 Senior Notes Due Two Thousand Eighteen [Member] [Domain] Level 2 [Member] | Dec. 31, 2013 7.15% senior notes due 2020 [Member] Level 2 [Member] | Dec. 31, 2012 7.15% senior notes due 2020 [Member] Level 2 [Member] | Apr. 30, 2012 7.00% senior notes due 2022 [Member] | Dec. 31, 2013 7.00% senior notes due 2022 [Member] Level 2 [Member] | Dec. 31, 2012 7.00% senior notes due 2022 [Member] Level 2 [Member] | Dec. 31, 2013 1.875% convertible senior notes due 2032 [Member] Level 2 [Member] | Dec. 31, 2012 1.875% convertible senior notes due 2032 [Member] Level 2 [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Principal | $ 99,825 | $ 175,000 | $ 175,000 | $ 300,000 | $ 200,000 | $ 300,000 | $ 300,000 | $ 300,000 | $ 126,500 | $ 126,500
Fair value of fixed-rate debt |  |  |  |  |  |  |  |  |  |
Estimated Fair Value | $ 102,950 |  | $ 174,125 | $ 325,500 | $ 220,760 |  | $ 318,750 | $ 328,500 | $ 142,154 | $ 127,449

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