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Contingent liabilities and other financial obligations, schedule of long-term supply agreement commitments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Raw material commitments under long-term supply agreements | $ 547,443 | $ 345,846
Less than one year |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Raw material commitments under long-term supply agreements | 222,321 | 109,207
1 to 5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Raw material commitments under long-term supply agreements | 325,122 | 236,639
More than 5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Raw material commitments under long-term supply agreements | $ 0 | $ 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Purchase Obligation1 + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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