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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Debt Disclosure [Abstract]    
Senior notes $ 252,143 $ 262,857
Capitalized lease and other obligations 6,060 6,328
Total long-term debt 258,203 269,185
Less: Current maturities (39,086) (39,354)
Total maturities due after one year $ 219,117 $ 229,831