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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts receivable, net:    
Accounts receivable, net $ 2,380,451 $ 2,160,561
Total assets:    
Total assets 4,178,465 3,697,246
Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 692,554 569,086
Allowance for bad debt 9,333 8,441
Total assets:    
Total assets 1,561,799 1,149,031
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,222,379 1,261,340
Allowance for bad debt 8,734 9,495
Total assets:    
Total assets 1,521,167 1,568,378
Land segment
    
Accounts receivable, net:    
Accounts receivable, net 465,518 330,135
Allowance for bad debt 7,121 6,365
Total assets:    
Total assets 992,690 816,595
Corporate
    
Total assets:    
Total assets $ 102,809 $ 163,242