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Accumulated other comprehensive income (loss) (Tables)
12 Months Ended
Dec. 31, 2017
Accumulated other comprehensive income (loss)  
Schedule of accumulated other comprehensive income (loss)

 

                                                                                                                                                                                                                      

 

 

 

 

 

 

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​  

​  

​  

​  

 

 

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

)

​  

​  

​  

​  

​