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Segment information - Operating results by segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of operating segments [line items] |  |  |  |
Revenue | $ 391,586 | $ 329,613 | $ 798,285 | $ 653,678
Cost of sales | (278,813) | (236,734) | (573,109) | (465,261)
Gross profit | 112,773 | 92,879 | 225,176 | 188,417
Adjusted EBITDA | $ 81,148 | $ 64,338 | $ 157,140 | $ 126,957
Adjusted EBITDA Margin | 20.70% | 19.50% | 19.70% | 19.40%
Depreciation amortization and impairment of intangible assets and property, plant and equipment | $ (24,239) | $ (24,035) | $ (49,029) | $ (46,277)
Share of profit of joint venture | (144) | (133) | (293) | (262)
Adjustment items | 25,692 | (1,950) | 19,972 | (5,179)
Earnings before taxes and finance income/costs (operating result (EBIT)) | 82,457 | 38,220 | 127,790 | 75,239
Rubber |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 248,915 | 207,298 | 513,943 | 415,255
Cost of sales | (194,191) | (164,179) | (400,798) | (322,827)
Gross profit | 54,724 | 43,119 | 113,145 | 92,428
Adjusted EBITDA | $ 35,923 | $ 25,953 | $ 71,579 | $ 54,345
Adjusted EBITDA Margin | 14.40% | 12.50% | 13.90% | 13.10%
Depreciation amortization and impairment of intangible assets and property, plant and equipment | $ (14,470) | $ (14,769) | $ (29,374) | $ (28,771)
Share of profit of joint venture | (144) | (133) | (293) | (262)
Specialties |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 142,671 | 122,315 | 284,342 | 238,423
Cost of sales | (84,622) | (72,555) | (172,311) | (142,434)
Gross profit | 58,049 | 49,760 | 112,031 | 95,989
Adjusted EBITDA | $ 45,225 | $ 38,385 | $ 85,561 | $ 72,612
Adjusted EBITDA Margin | 31.70% | 31.30% | 30.10% | 30.40%
Depreciation amortization and impairment of intangible assets and property, plant and equipment | $ (9,769) | $ (9,266) | $ (19,655) | $ (17,506)
Share of profit of joint venture | $ 0 | $ 0 | $ 0 | $ 0

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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