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Long-Term Debt--Components of Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
9.875% Senior Notes due 2020
Dec. 31, 2013
9.875% Senior Notes due 2020
Jun. 30, 2014
9.875% Senior Notes due 2020
Senior Notes
Jun. 30, 2014
8.25% Senior Notes due 2021
Dec. 31, 2013
8.25% Senior Notes due 2021
Jun. 30, 2014
8.25% Senior Notes due 2021
Senior Notes
Jun. 30, 2014
7.625% Senior Notes due 2022
Dec. 31, 2013
7.625% Senior Notes due 2022
Jun. 30, 2014
7.625% Senior Notes due 2022
Senior Notes
Jun. 30, 2014
Minimum
Mortgages
Jun. 30, 2014
Minimum
Secured Debt
Jun. 30, 2014
Maximum
Mortgages
Jun. 30, 2014
Maximum
Secured Debt
Components of long-term debt                              
Senior Notes     $ 294,839 $ 294,556   $ 400,000 $ 400,000   $ 555,286 $ 555,719          
Senior secured revolving credit facility 249,000 272,000                          
Real estate mortgage notes payable 10,957 11,202                          
Installment notes payable 5,081 5,235                          
Capital lease obligations 23,004 24,150                          
Total long-term debt and capital lease obligations 1,538,167 1,562,862                          
Less current maturities 5,623 5,334                          
Long-term debt and capital leases, less current maturities 1,532,544 1,557,528                          
Stated interest rate         9.875%     8.25%     7.625% 2.54% 2.85% 5.46% 6.44%
Maturity date (year)         2020     2021     2022        
Maturity date (month and year)                       2021-08 2014-08 2028-12 2018-02
Unamortized discount     5,161 5,444                      
Unamortized premium                 $ 5,286 $ 5,719