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Trade Receivables | 12 Months Ended
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Dec. 31, 2017
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Trade Receivables | 12. TRADE RECEIVABLES
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |
Accounts receivable and related parties (1) |  |  | 2,210 |  |  |  | 41,972 |  |  |  | 87 |  |  |  | 34,729 |  |  |  | 469 |  |  |  | 22,959 |
Provision for doubtful trade receivables |  |  | — |  |  |  | (1,323 | ) |  |  | — |  |  |  | (1,084 | ) |  |  | — |  |  |  | (848 | )
|  |  | 2,210 |  |  |  | 40,649 |  |  |  | 87 |  |  |  | 33,645 |  |  |  | 469 |  |  |  | 22,111 |
(1) | See Note 31 for information about related parties.
Changes in the provision for doubtful trade receivables
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |
Balance at beginning of year |  |  | — |  |  |  | 1,084 |  |  |  | — |  |  |  | 848 |  |  |  | 7 |  |  |  | 866 |
Increases charged to expenses |  |  | — |  |  |  | 222 |  |  |  | — |  |  |  | 197 |  |  |  | — |  |  |  | 313 |
Decreases charged to income |  |  | — |  |  |  | (194 | ) |  |  | — |  |  |  | (28 | ) |  |  | — |  |  |  | (412 | )
Amounts incurred due to utilization |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | (17 | )
Other movements |  |  | — |  |  |  | 119 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Translation differences |  |  | — |  |  |  | 92 |  |  |  | — |  |  |  | 67 |  |  |  | — |  |  |  | 98 |
Balance at end of year |  |  | — |  |  |  | 1,323 |  |  |  | — |  |  |  | 1,084 |  |  |  | — |  |  |  | 848 |

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- Definition Text block1 [abstract] + References No definition available. + Details
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