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Significant Accounting Policies (Details) (USD $) |  |  |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 2012 Acquisitions Land segment Adjustment | Jun. 30, 2013 2012 Acquisitions Land segment Reclassification | Jun. 30, 2013 2012 Acquisitions Aviation segment Adjustment | Jun. 30, 2013 2012 Acquisitions Aviation segment Reclassification | Jun. 30, 2013 2012 Acquisitions Marine segment Adjustment
Accounts Receivable Purchase Agreement |  |  |  |  |  |  |
Maximum amount of accounts receivable to be sold under a Receivables Purchase Agreement ("RPA") | $ 125,000,000 |  |  |  |  |  |
Percentage rate added to floating market rate to get discount margin | 2.00% |  |  |  |  |  |
Accounts receivable sold | 68,000,000 |  |  |  |  |  |
Retained beneficial interest recorded | 5,300,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill | 467,749,000 | 470,506,000 | (2,000,000) | (6,500,000) |  | 6,500,000 |
Reclassification to identifiable intangible assets |  |  | 3,300,000 |  |  |  |
Increase (decrease) in acquired net assets |  |  | (900,000) |  |  |  |
Increase in assumed liabilities |  |  | 400,000 |  |  |  |
Reductions in goodwill due to foreign currency translation adjustments |  |  |  |  | $ (200,000) |  | $ (500,000)

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