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Business Segments (Details 2) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Accounts receivable, net:  
Accounts receivable, net$ 2,166,712$ 1,386,700
Total assets:  
Total assets3,616,8962,566,450
Aviation segment
  
Accounts receivable, net:  
Accounts receivable, net610,569420,788
Net of allowance for bad debt9,7657,363
Total assets:  
Total assets1,191,791740,563
Marine segment
  
Accounts receivable, net:  
Accounts receivable, net1,196,741761,629
Net of allowance for bad debt8,8507,761
Total assets:  
Total assets1,528,4681,000,042
Land segment
  
Accounts receivable, net:  
Accounts receivable, net359,402204,283
Net of allowance for bad debt6,3105,077
Total assets:  
Total assets756,037524,592
Corporate
  
Total assets:  
Total assets$ 140,600$ 301,253