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Business Segments, Geographic Information, and Major Customers (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Accounts receivable, net: |  |  |
Accounts receivable, net | $ 2,193,866 | $ 2,160,561 |
Goodwill |  |  |
Goodwill | 470,506 | 346,246 | 287,434
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 172,273 | 107,620 |
Total assets: |  |  |
Total assets | 4,107,751 | 3,697,246 |
Aviation segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 674,973 | 569,086 |
Allowance for bad debt | 8,997 | 8,441 |
Goodwill |  |  |
Goodwill | 109,332 | 102,509 | 61,608
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 38,874 | 42,880 |
Total assets: |  |  |
Total assets | 1,463,423 | 1,149,031 |
Marine segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 1,069,833 | 1,261,340 |
Allowance for bad debt | 7,742 | 9,495 |
Goodwill |  |  |
Goodwill | 69,931 | 70,522 | 71,220
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 6,656 | 8,659 |
Total assets: |  |  |
Total assets | 1,330,796 | 1,568,378 |
Land segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 449,060 | 330,135 |
Allowance for bad debt | 6,980 | 6,365 |
Goodwill |  |  |
Goodwill | 291,243 | 173,215 | 154,606
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 126,743 | 56,081 |
Total assets: |  |  |
Total assets | 1,145,756 | 816,595 |
Corporate |  |  |
Total assets: |  |  |
Total assets | $ 167,776 | $ 163,242 |

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