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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
8.75% Senior Notes due 2020 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 8.75% | 8.75%
Debt maturity date | 2020 | 2020
Long-term debt, discount | $ 5,101 | $ 5,264
7.5% Senior Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 7.50% | 7.50%
Debt maturity date | 2021 | 2021
Long term debt, premium | 3,816 | 3,922
8.125% Senior Notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 8.125% | 8.125%
Debt maturity date | 2022 | 2022
7.5% Senior Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 7.50% | 7.50%
Debt maturity date | 2023 | 2023
Long-term debt, discount | $ 3,679 | $ 3,751

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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