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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2012
Long-Term Debt  
Components Of Long-Term Debt
   March 31, December 31,
   2012 2011
        
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
        
     447,558   458,763
Less current portion    10,139   10,800
        
 Long-term debt  $ 437,419 $ 447,963