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Long-Term Debt--Components of Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
9.875% Senior Notes due 2020
Dec. 31, 2013
9.875% Senior Notes due 2020
Sep. 30, 2014
9.875% Senior Notes due 2020
Senior Notes
Sep. 30, 2014
8.25% Senior Notes due 2021
Dec. 31, 2013
8.25% Senior Notes due 2021
Sep. 30, 2014
8.25% Senior Notes due 2021
Senior Notes
Sep. 30, 2014
7.625% Senior Notes due 2022
Dec. 31, 2013
7.625% Senior Notes due 2022
Sep. 30, 2014
7.625% Senior Notes due 2022
Senior Notes
Sep. 30, 2014
Minimum
Mortgages
Sep. 30, 2014
Minimum
Secured Debt
Sep. 30, 2014
Maximum
Mortgages
Sep. 30, 2014
Maximum
Secured Debt
Components of long-term debt                              
Senior Notes     $ 294,987 $ 294,556   $ 400,000 $ 400,000   $ 555,076 $ 555,719          
Senior secured revolving credit facility 232,000 272,000                          
Real estate mortgage notes payable 10,832 11,202                          
Installment notes payable 5,032 5,235                          
Capital lease obligations 22,423 24,150                          
Total long-term debt and capital lease obligations 1,520,350 1,562,862                          
Less current maturities 5,677 5,334                          
Long-term debt and capital leases, less current maturities 1,514,673 1,557,528                          
Stated interest rate         9.875%     8.25%     7.625% 2.54% 2.85% 5.46% 5.95%
Maturity date (year)         2020     2021     2022        
Maturity date (month and year)                       2021-08 2014-10 2028-12 2018-02
Unamortized discount     5,013 5,444                      
Unamortized premium                 $ 5,076 $ 5,719