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Other operating income, other operating expenses, restructuring income and expenses, financial result - Restructuring expenses (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) site | Jun. 30, 2017 USD ($)
Analysis of income and expense [abstract] |  |  |  |
Restructuring expense, land restoration |  |  | $ 4,021 |
Number of sites consolidated | site |  |  | 2 |
Restructuring expense, personnel related termination costs |  |  | $ 4,363 |
Net restructuring income | $ 29,751 | $ (319) | $ 28,485 | $ (722)

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