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Debt (Tables)
 6 Months Ended
Jun. 30, 2011
Debt (Tables) [Abstract]  
Outstanding Debt Balances
                 
    June 30, 2011     December 31, 2010  
Notes payable — current:
               
Uncommitted lines of credit
  $ 43,784     $ 15,038  
Other
    116       —  
 
           
 
  $ 43,900     $ 15,038  
 
           
 
               
Long-term debt:
               
Credit facility
  $ 330,000     $ 235,000  
Senior notes
    300,000       300,000  
Industrial development revenue bonds
    11,900       11,900  
Other
    2,761       3,468  
 
           
 
  $ 644,661     $ 550,368