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Accumulated other comprehensive income (loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated other comprehensive income (loss) |
Schedule of accumulated other comprehensive income (loss) |
​ | ​ | ​ | ​ | ​ | ​
|  | As of December 31, 2017 |  | As of December 31, 2016 |
​ | ​ | ​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Foreign currency translation adjustments |  | $ | 15,468 |  | $ | (7,560 | )
Commodities and foreign currency derivatives |  | 4,821 |  | 2 |
​ | ​ | ​ | ​ | ​ | ​
Total accumulated comprehensive income (loss) |  | $ | 20,289 |  | $ | (7,558 | )
​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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