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Fair Value Disclosures (Details 1) (Level 2 [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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4.50% senior notes due two thousand eighteen [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | $ 175,000 | $ 175,000
Estimated Fair Value | 179,375 | 174,125
7.15% senior notes due 2020 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 300,000 | 300,000
Estimated Fair Value | 334,500 | 325,500
7.00% senior notes due 2022 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 300,000 | 300,000
Estimated Fair Value | 330,750 | 318,750
1.875% convertible senior notes due 2032 [Member] |  |
Fair value of fixed-rate debt |  |
Aggregate Principal | 126,500 | 126,500
Estimated Fair Value | $ 133,774 | $ 142,154

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