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Long-Term Debt (Components Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Long-Term Debt    
Revolving credit agreement $ 342,500 $ 351,000
Fixed rate senior secured notes 75,000 75,000
Other debt 18,184 20,052
Capitalized lease arrangements 11,874 12,711
Long-term debt, gross $ 447,558 $ 458,763