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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
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 (loss) income is set forth in the following table:
 As of
December 31, 2020
As of
December 31, 2019
 (Dollars in thousands)
Foreign currency translation adjustments, net of tax$(2,725)$(9,293)
Commodities, foreign currency and interest rate derivatives, net of tax(16,916)1,932 
Total accumulated comprehensive (loss) income$(19,641)$(7,361)