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Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,290,085 | $ 2,160,561
Total assets: |  |
Total assets | 3,925,804 | 3,697,246
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 608,959 | 569,086
Allowance for bad debt | 8,419 | 8,441
Total assets: |  |
Total assets | 1,290,714 | 1,149,031
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,260,189 | 1,261,340
Allowance for bad debt | 9,422 | 9,495
Total assets: |  |
Total assets | 1,573,637 | 1,568,378
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 420,937 | 330,135
Allowance for bad debt | 6,456 | 6,365
Total assets: |  |
Total assets | 932,108 | 816,595
Corporate |  |
Total assets: |  |
Total assets | $ 129,345 | $ 163,242

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