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Long-Term Debt--Parenthetical (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
9.875% Senior Notes due 2020
Dec. 31, 2012
9.875% Senior Notes due 2020
Dec. 31, 2013
7.625% Senior Notes due 2022
Dec. 31, 2012
7.625% Senior Notes due 2022
Dec. 31, 2013
Mortgages
Minimum
Dec. 31, 2013
Mortgages
Maximum
Dec. 31, 2013
Secured Debt
Minimum
Dec. 31, 2013
Secured Debt
Maximum
Debt Instrument [Line Items]                
Stated interest rate         2.54% 5.46% 2.87% 6.79%
Maturity date         2021-08 2028-12 2014-01 2018-02
Unamortized discount on 9.875% Senior Notes due 2020 $ 5,444 $ 5,969            
Unamortized premium on 7.625% Senior Notes due 2022     $ 5,719 $ 6,631