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Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Accounts receivable, net: |  |
Accounts receivable, net | $ 2,837,050 | $ 2,538,642
Total assets: |  |
Total assets | 5,523,665 | 4,739,277
Aviation Segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 833,478 | 771,178
Allowance for bad debt | 7,121 | 9,351
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,243,994 | 1,205,005
Allowance for bad debt | 10,063 | 9,845
Land Segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 759,578 | 562,459
Allowance for bad debt | 10,845 | 9,992
Operating Segments | Aviation Segment |  |
Total assets: |  |
Total assets | 1,878,198 | 1,708,569
Operating Segments | Marine segment |  |
Total assets: |  |
Total assets | 1,680,701 | 1,553,267
Operating Segments | Land Segment |  |
Total assets: |  |
Total assets | 1,784,749 | 1,304,436
Corporate |  |
Total assets: |  |
Total assets | $ 180,017 | $ 173,005

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