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Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,514,683 | $ 2,193,866
Total assets: |  |
Total assets | 4,656,400 | 4,107,751
Corporate |  |
Total assets: |  |
Total assets | 191,107 | 167,776
Operating Segments | Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 725,468 | 674,973
Allowance for bad debt | 10,304 | 8,997
Total assets: |  |
Total assets | 1,715,578 | 1,463,423
Operating Segments | Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,186,126 | 1,069,833
Allowance for bad debt | 9,314 | 7,742
Total assets: |  |
Total assets | 1,454,056 | 1,330,796
Operating Segments | Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 603,089 | 449,060
Allowance for bad debt | 7,391 | 6,980
Total assets: |  |
Total assets | $ 1,295,659 | $ 1,145,756

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