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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 item | Jun. 30, 2012
Business Segments |  |  |  |
Number of reportable operating business segments |  |  | 3 |
Revenue: |  |  |  |
Total revenue | $ 10,479,604 | $ 9,618,797 | $ 20,663,633 | $ 19,097,852
Gross profit: |  |  |  |
Gross profit | 188,458 | 172,123 | 370,837 | 329,358
Income from operations: |  |  |  |
Income from operations | 68,736 | 72,358 | 135,677 | 131,614
Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | 79,057 | 82,243 | 156,576 | 152,721
Aviation segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 3,745,070 | 3,547,871 | 7,675,658 | 6,959,418
Gross profit: |  |  |  |
Gross profit | 76,041 | 69,171 | 153,025 | 134,085
Income from operations: |  |  |  |
Income from operations | 33,873 | 25,960 | 68,753 | 52,793
Marine segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 3,967,109 | 3,767,144 | 7,684,248 | 7,671,335
Gross profit: |  |  |  |
Gross profit | 52,332 | 51,748 | 94,014 | 106,825
Income from operations: |  |  |  |
Income from operations | 24,062 | 27,931 | 39,321 | 55,376
Land segment |  |  |  |
Revenue: |  |  |  |
Total revenue | 2,767,425 | 2,303,782 | 5,303,727 | 4,467,099
Gross profit: |  |  |  |
Gross profit | 60,085 | 51,204 | 123,798 | 88,448
Income from operations: |  |  |  |
Income from operations | 21,122 | 28,352 | 48,502 | 44,552
Corporate |  |  |  |
Income from operations: |  |  |  |
Corporate overhead | $ 10,321 | $ 9,885 | $ 20,899 | $ 21,107

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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