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Long-Term Debt (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
9.875% Senior Notes due 2016, net of $8,843 discount at December 31, 2012
   
Debt Instrument [Line Items]    
Debt maturity date 2016 2016
Long-term debt, fixed interest rate 9.875% 9.875%
Long term debt, discount   $ 8,843
8.0% Senior Notes due 2018
   
Debt Instrument [Line Items]    
Debt maturity date 2018 2018
Long-term debt, fixed interest rate 8.00% 8.00%
8.75% Senior Notes due 2020, net of $5,264 and $5,873 discount, respectively
   
Debt Instrument [Line Items]    
Debt maturity date 2020 2020
Long-term debt, fixed interest rate 8.75% 8.75%
Long term debt, discount 5,264 5,873
7.5% Senior Notes due 2021, including a premium of $3,922 and $4,328, respectively
   
Debt Instrument [Line Items]    
Debt maturity date 2021 2021
Long-term debt, fixed interest rate 7.50% 7.50%
Long term debt, premium 3,922 4,328
8.125% Senior Notes due 2022
   
Debt Instrument [Line Items]    
Debt maturity date 2022 2022
Long-term debt, fixed interest rate 8.125% 8.125%
7.5% Senior Notes due 2023, net of $3,751 and $4,029 discount, respectively
   
Debt Instrument [Line Items]    
Debt maturity date 2023 2023
Long-term debt, fixed interest rate 7.50% 7.50%
Long term debt, discount $ 3,751 $ 4,029