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Contingent liabilities and other financial obligations (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of contingent liabilities [abstract] |
Disclosure of long-term supply commitments | To safeguard the supply of raw materials, contractual purchase commitments under long-term supply agreements for raw materials, especially oil and gas, are in place with the following maturities:
|  | In USD k
|  | As at Jun 30, |  | As at Dec 31,
Maturity |  | 2018 |  | 2017
Less than one year |  | 222,321 |  |  | 109,207 |
1 to 5 years |  | 325,122 |  |  | 236,639 |
More than 5 years |  | — |  |  | — |
Total |  | 547,443 |  |  | 345,846 |

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