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Accounts Receivable, net (Tables) | 9 Months Ended
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Sep. 30, 2018
Receivables [Abstract] |
Schedule of Accounts Receivable | Accounts receivable at September 30, 2018 and December 31, 2017 were as follows (in thousands):
| September 30, |  | December 31,
| 2018 |  | 2017
Trade accounts receivable, net of allowance of $3,915 and $4,777, respectively | $ | 98,997 |  |  | $ | 83,482 |
Unbilled revenue | 49,700 |  |  | 25,670 |
Taxes receivable | 9,423 |  |  | 11,305 |
Affiliated (1) | 549 |  |  | 716 |
Other receivables | 4,351 |  |  | 6,037 |
Total accounts receivable, net | $ | 163,020 |  |  | $ | 127,210 |
(1) | Amounts represent expenditures on behalf of non-consolidated affiliates.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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