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Segment information - Reconciliation of adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Restructuring And Related Costs [Line Items] |  |  |  |
Profit for the period | $ 52,691 | $ 18,428 | $ 76,919 | $ 35,243
Add back income taxes | 20,558 | 9,023 | 33,722 | 18,986
Profit before income taxes | 73,249 | 27,451 | 110,641 | 54,229
Add back finance costs | 28,475 | 17,147 | 37,420 | 41,355
Add back share of profit of joint ventures | (144) | (133) | (293) | (262)
Add back other finance income | (19,123) | (6,245) | (19,978) | (20,083)
Earnings before taxes and finance income/costs (operating result (EBIT)) | 82,457 | 38,220 | 127,790 | 75,239
Add back depreciation, amortization and impairment of intangible assets and property, plant and equipment | 24,239 | 24,035 | 49,029 | 46,277
EBITDA | 106,696 | 62,255 | 176,819 | 121,516
Add back restructuring (income)/expenses, net | (29,751) | 319 | (28,485) | 722
Add back consulting fees related to Group strategy | 151 | 810 | 1,035 | 1,049
Add back long term incentive plan | 2,853 | 1,609 | 5,953 | 3,209
Add back other adjustments | 1,055 | (788) | 1,525 | 199
Adjusted EBITDA | 81,148 | 64,338 | 157,140 | 126,957
EPA enforcement action expense | $ 1,100 | 500 | $ 1,100 | 1,400
Reimbursed reassessed real estate transfer tax |  | $ 1,500 |  | $ 1,500

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