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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts receivable, net:    
Accounts receivable, net $ 2,494,373 $ 2,193,866
Total assets:    
Total assets 4,409,257 4,107,751
Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 694,816 674,973
Allowance for bad debt 8,901 8,997
Total assets:    
Total assets 1,490,633 1,463,423
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,240,230 1,069,833
Allowance for bad debt 8,425 7,742
Total assets:    
Total assets 1,519,351 1,330,796
Land segment
    
Accounts receivable, net:    
Accounts receivable, net 559,327 449,060
Allowance for bad debt 6,804 6,980
Total assets:    
Total assets 1,229,576 1,145,756
Corporate
    
Total assets:    
Total assets $ 169,697 $ 167,776