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Accounts Receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | Accounts receivable at December 31, 2017 and 2016 were as follows (in thousands):
| December 31,
| 2017 |  | 2016
Trade accounts receivable, net of allowance of $4,777 and $14,337, respectively | $ | 83,482 |  |  | $ | 89,096 |
Unbilled receivables | 25,670 |  |  | 30,882 |
Taxes receivable | 11,305 |  |  | 42,870 |
Affiliated (1) | 716 |  |  | 717 |
Other receivables | 6,037 |  |  | 3,852 |
Total accounts receivable, net | $ | 127,210 |  |  | $ | 167,417 |
(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 + Details
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