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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Accounts receivable, net:    
Accounts receivable, net $ 2,290,085 $ 2,160,561
Total assets:    
Total assets 3,925,804 3,697,246
Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 608,959 569,086
Allowance for bad debt 8,419 8,441
Total assets:    
Total assets 1,290,714 1,149,031
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,260,189 1,261,340
Allowance for bad debt 9,422 9,495
Total assets:    
Total assets 1,573,637 1,568,378
Land segment
    
Accounts receivable, net:    
Accounts receivable, net 420,937 330,135
Allowance for bad debt 6,456 6,365
Total assets:    
Total assets 932,108 816,595
Corporate
    
Total assets:    
Total assets $ 129,345 $ 163,242