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Accounts Receivable, net (Tables) | 6 Months Ended
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Jun. 30, 2015
Receivables [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | Accounts receivable at June 30, 2015 and December 31, 2014 were as follows (in thousands):
| June 30, |  | December 31,
| 2015 |  | 2014
Trade accounts receivable, net of allowance |  |  |
of $2,680 and $2,477, respectively | $ | 219,279 |  |  | $ | 291,140 |
Unbilled revenue | 60,719 |  |  | 62,993 |
Taxes receivable | 39,674 |  |  | 32,056 |
Affiliated (1) | 3,365 |  |  | 3,370 |
Other receivables | 1,654 |  |  | 1,418 |
Total accounts receivable | $ | 324,691 |  |  | $ | 390,977 |
(1) | Amounts represent expenditures on behalf of non-consolidated affiliates and receivables for aircraft charter income.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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