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Business Segments (Details 2) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Accounts receivable, net:    
Accounts receivable, net $ 1,982,962 $ 1,386,700
Total assets:    
Total assets 3,362,058 2,566,450
Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 635,729 420,788
Net of allowance for bad debt 8,787 7,363
Total assets:    
Total assets 1,183,941 740,563
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,068,220 761,629
Net of allowance for bad debt 8,129 7,761
Total assets:    
Total assets 1,374,837 1,000,042
Land segment
    
Accounts receivable, net:    
Accounts receivable, net 279,013 204,283
Net of allowance for bad debt 5,818 5,077
Total assets:    
Total assets 679,509 524,592
Corporate
    
Total assets:    
Total assets $ 123,771 $ 301,253