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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The balance in our accumulated other comprehensive income (loss) is set forth in the following table:
 
As of
December 31,
2018
 
As of
December 31,
2017
 
(Dollars in thousands)
Foreign currency translation adjustments, net of tax
$
(2,922
)
 
$
15,468

Commodities and foreign currency derivatives, net of tax
(2,878
)
 
4,821

Total accumulated comprehensive (loss) income
$
(5,800
)
 
$
20,289