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Long-Term Debt (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
8.75% Senior Notes due 2020
   
Debt Instrument    
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
   
Debt Instrument    
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
   
Debt Instrument    
Long-term debt, fixed interest rate 8.125% 8.125%
Debt maturity date 2022 2022
7.5% Senior Notes due 2023
   
Debt Instrument    
Long-term debt, fixed interest rate 7.50% 7.50%
Debt maturity date 2023 2023
Long term debt, discount $ 3,679 $ 3,751