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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
9.875% Senior Notes due 2016
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 9.875% 9.875%
Debt maturity date 2016  
Long term debt, discount $ 8,843 $ 10,921
8.0% Senior Notes due 2018
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 8.00% 8.00%
Debt maturity date 2018  
8.75% Senior Notes due 2020
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 8.75% 8.75%
Debt maturity date 2020  
Long term debt, discount 5,873 6,432
7.5% Senior Notes due 2021
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 7.50% 7.50%
Debt maturity date 2021  
Long term debt, premium 4,328  
8.125% Senior Notes due 2022
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 8.125%  
Debt maturity date 2022  
7.5% Senior Notes due 2023
   
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Long-term debt, fixed interest rate 7.50%  
Debt maturity date 2023  
Long term debt, discount $ 4,029