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Provisions (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Changes in Group's Provisions | Changes in the Group’s provisions for the fiscal years ended December 31, 2017, 2016 and 2015 are as follows:
|  | Provision for pending lawsuits and contingencies |  |  | Provision for environmental liabilities |  |  | Provision for hydrocarbon wells abandonment obligations |  |  | Provision for pensions |  |  | Total |
|  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |  |  | Noncurrent |  |  | Current |
Amount as of December 31, 2014 |  |  | 7,014 |  |  |  | 851 |  |  |  | 1,269 |  |  |  | 1,145 |  |  |  | 18,087 |  |  |  | 376 |  |  |  | 194 |  |  |  | 27 |  |  |  | 26,564 |  |  |  | 2,399 |
Increases charged to expenses |  |  | 2,062 |  |  |  | 95 |  |  |  | 986 |  |  |  | — |  |  |  | 1,694 |  |  |  | — |  |  |  | 23 |  |  |  | — |  |  |  | 4,765 |  |  |  | 95 |
Decreases charged to income |  |  | (434 | ) |  |  | (141 | ) |  |  | — |  |  |  | — |  |  |  | (314 | ) |  |  | — |  |  |  | — |  |  |  | (13 | ) |  |  | (748 | ) |  |  | (154 | )
Amounts incurred due to payments/utilization |  |  | — |  |  |  | (374 | ) |  |  | — |  |  |  | (1,030 | ) |  |  | — |  |  |  | (283 | ) |  |  | — |  |  |  | (71 | ) |  |  | — |  |  |  | (1,758 | )
Net exchange and translation differences |  |  | 2,383 |  |  |  | 10 |  |  |  | 464 |  |  |  | 186 |  |  |  | 10,109 |  |  |  | 159 |  |  |  | 102 |  |  |  | 17 |  |  |  | 13,058 |  |  |  | 372 |
Increase from JO interest acquisition |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (504 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (504 | )
Reclassifications and other movements |  |  | (650 | ) |  |  | (292 | ) |  |  | (1,099 | ) |  |  | 1,099 |  |  |  | (2,196 | )(1) |  |  | 681 | (1) |  |  | (71 | ) |  |  | 71 |  |  |  | (4,016 | ) |  |  | 1,559 |
Amount as of December 31, 2015 |  |  | 10,375 |  |  |  | 149 |  |  |  | 1,620 |  |  |  | 1,400 |  |  |  | 27,380 |  |  |  | 429 |  |  |  | 248 |  |  |  | 31 |  |  |  | 39,623 |  |  |  | 2,009 |
Increases charged to expenses |  |  | 1,579 |  |  |  | 335 |  |  |  | 962 |  |  |  | 32 |  |  |  | 3,023 |  |  |  | — |  |  |  | 97 |  |  |  | — |  |  |  | 5,661 |  |  |  | 367 |
Decreases charged to income |  |  | (158 | ) |  |  | (258 | ) |  |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | (77 | ) |  |  | (1 | ) |  |  | — |  |  |  | (169 | ) |  |  | (335 | )
Amounts incurred due to payments/utilization |  |  | 9 |  |  |  | (239 | ) |  |  | — |  |  |  | (869 | ) |  |  | (48 | ) |  |  | (584 | ) |  |  | — |  |  |  | (13 | ) |  |  | (39 | ) |  |  | (1,705 | )
Net exchange and translation differences |  |  | 1,221 |  |  |  | 7 |  |  |  | 159 |  |  |  | 52 |  |  |  | 6,245 |  |  |  | 94 |  |  |  | 26 |  |  |  | 3 |  |  |  | 7,651 |  |  |  | 156 |
Deconsolidation of subsidiaries |  |  | (2,213 | ) |  |  | (11 | ) |  |  | (1,351 | ) |  |  | (607 | ) |  |  | (515 | ) |  |  | — |  |  |  | (357 | ) |  |  | (34 | ) |  |  | (4,436 | ) |  |  | (652 | )
Reclassifications and other movements |  |  | (1,608 | )(2) |  |  | 586 |  |  |  | (860 | ) |  |  | 860 |  |  |  | 1,548 | (1) |  |  | 695 | (1) |  |  | (13 | ) |  |  | 13 |  |  |  | (933 | ) |  |  | 2,154 |
Amount as of December 31, 2016 |  |  | 9,205 |  |  |  | 569 |  |  |  | 530 |  |  |  | 868 |  |  |  | 37,623 |  |  |  | 557 |  |  |  | — |  |  |  | — |  |  |  | 47,358 |  |  |  | 1,994 |
Increases charged to expenses |  |  | 2,394 |  |  |  | 83 |  |  |  | 1,483 |  |  |  | — |  |  |  | 2,946 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,823 |  |  |  | 83 |
Decreases charged to income |  |  | (1,570 | ) |  |  | (410 | ) |  |  | (6 | ) |  |  | — |  |  |  | 8 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | (1,568 | ) |  |  | (408 | )
Amounts incurred due to payments/utilization |  |  | (25 | ) |  |  | (187 | ) |  |  | — |  |  |  | (661 | ) |  |  | — |  |  |  | (515 | ) |  |  | — |  |  |  | — |  |  |  | (25 | ) |  |  | (1,363 | )
Net exchange and translation differences |  |  | 1,483 |  |  |  | 75 |  |  |  | — |  |  |  | — |  |  |  | 6,874 |  |  |  | 121 |  |  |  | — |  |  |  | — |  |  |  | 8,357 |  |  |  | 196 |
Reclassifications and other movements |  |  | 180 | (3) |  |  | 558 |  |  |  | (811 | ) |  |  | 811 |  |  |  | (5,580 | )(1) |  |  | 571 | (1) |  |  | — |  |  |  | — |  |  |  | (6,211 | ) |  |  | 1,940 |
Amount as of December 31, 2017 |  |  | 11,667 |  |  |  | 688 |  |  |  | 1,196 |  |  |  | 1,018 |  |  |  | 41,871 |  |  |  | 736 |  |  |  | — |  |  |  | — |  |  |  | 54,734 |  |  |  | 2,442 |
(1) | Includes (4,913), 2,243 and (1,281) corresponding to the annual recalculation of costs for abandonment of hydrocarbon wells for the years ended December 31, 2017, 2016 and 2015, respectively; (96) corresponding to liabilities reclassified as Liabilities associated to assets held for disposal as of December 31, 2017; (226) corresponding to the decrease due to the change in the participation of the Magallanes area as of December 31, 2015; and (8) corresponding to December 31, 2015; and (8) corresponding to a decrease in the Puesto Cortadera area as of December 31, 2015;
(2) | Includes (950) corresponding to resolutions for contractual claims that were reclassified to Other liabilities (see Note 14.a.2); and (75) corresponding to tax claims that were reclassified as Tax Charges.
(3) | Includes (2,098) corresponding to resolutions for contractual claims that were reclassified to Other liabilities (see Note 14.a.2); and 2,932 of reclassifications of Other liabilities (see Note 27).

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