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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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7.731% senior subordinated notes due 2017 [Member] | Level 2 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal |  | $ 99,825
Estimated Fair Value |  | 102,950
4.50% senior notes due two thousand eighteen [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 175,000 |
4.50% senior notes due two thousand eighteen [Member] | Level 2 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 175,000 |
Estimated Fair Value | 171,938 |
7.15% senior notes due 2020 [Member] | Level 2 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 200,000 | 200,000
Estimated Fair Value | 216,000 | 220,760
7.00% senior notes due 2022 [Member] | Level 2 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 300,000 | 300,000
Estimated Fair Value | 318,000 | 328,500
1.875% convertible senior notes due 2032 [Member] | Level 2 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 126,500 | 126,500
Estimated Fair Value | $ 135,829 | $ 127,449

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