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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Foreign currency translation adjustments, net of tax $ (6,461) $ (2,922)
Commodities and foreign currency derivatives, net of tax 22,779 (2,878)
Total accumulated comprehensive income (loss) $ 16,318 $ (5,800)