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Fair Value Disclosures (Details) - Senior Notes [Member] - USD ($) | Jun. 30, 2015 | Jun. 02, 2015 | Dec. 31, 2014
--- | --- | --- | ---
4.50% senior notes due 2018 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | $ 175,000,000 |  | $ 175,000,000
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 178,500,000 |  | 175,000,000
7.15% senior notes due 2020 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 300,000,000 |  | 300,000,000
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 323,250,000 |  | 322,500,000
7.00% senior notes due 2022 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 300,000,000 |  | 300,000,000
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 320,250,000 |  | 318,000,000
6.00% senior notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal |  | $ 200,000,000 |
6.00% senior notes due 2025 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 200,000,000 |  |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 201,000,000 |  |
1.875% convertible senior notes due 2032 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 126,500,000 |  | 126,500,000
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | $ 133,299,000 |  | $ 124,444,000

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