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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts receivable, net:    
Accounts receivable, net $ 2,587,977 $ 2,193,866
Total assets:    
Total assets 4,529,138 4,107,751
Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 713,430 674,973
Allowance for bad debt 9,312 8,997
Total assets:    
Total assets 1,489,090 1,463,423
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,289,119 1,069,833
Allowance for bad debt 9,706 7,742
Total assets:    
Total assets 1,584,546 1,330,796
Land segment
    
Accounts receivable, net:    
Accounts receivable, net 585,428 449,060
Allowance for bad debt 7,060 6,980
Total assets:    
Total assets 1,279,638 1,145,756
Corporate
    
Total assets:    
Total assets $ 175,864 $ 167,776