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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 item | Sep. 30, 2012
Business Segments |  |  |  |
Number of reportable operating business segments |  |  | 3 |
Revenue: |  |  |  |
Total revenue | $ 10,493,661 | $ 9,911,673 | $ 31,157,294 | $ 29,009,525
Gross profit: |  |  |  |
Gross profit | 186,341 | 180,752 | 557,178 | 510,110
Income from operations: |  |  |  |
Income from operations | 64,203 | 71,048 | 199,880 | 202,662
Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | 73,127 | 85,289 | 229,703 | 238,010
Operating Segments | Aviation segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 4,179,018 | 3,823,338 | 11,854,676 | 10,782,756
Gross profit: |  |  |  |
Gross profit | 89,758 | 84,197 | 242,783 | 218,282
Income from operations: |  |  |  |
Income from operations | 41,002 | 39,808 | 109,755 | 92,601
Operating Segments | Marine segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 3,575,777 | 3,630,094 | 11,260,025 | 11,301,429
Gross profit: |  |  |  |
Gross profit | 40,223 | 53,960 | 134,237 | 160,785
Income from operations: |  |  |  |
Income from operations | 17,019 | 27,296 | 56,340 | 82,672
Operating Segments | Land segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 2,738,866 | 2,458,241 | 8,042,593 | 6,925,340
Gross profit: |  |  |  |
Gross profit | 56,360 | 42,595 | 180,158 | 131,043
Income from operations: |  |  |  |
Income from operations | 15,106 | 18,185 | 63,608 | 62,737
Corporate |  |  |  |
Income from operations: |  |  |  |
Income from operations | $ 8,924 | $ 14,241 | $ 29,823 | $ 35,348

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