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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2017
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Proceeds from sale of property, plant and equipment     $ 2,841 $ 141,530 $ 45,635
Gain on sale K1 factory     $ (5,310) $ 2,648 $ (1,390)
Korea          
Property, Plant and Equipment [Line Items]          
Proceeds from sale of property, plant and equipment $ 142,400 $ 142,400      
Percentage of proceeds received   10.00%      
Gain on sale K1 factory $ 108,100