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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
Nov. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment [Line Items]            
Proceeds from sale of property, plant and equipment         $ 603 $ 130,962
Pre-tax gain at close     $ 0 $ 108,109 $ 0 $ 108,109
Korea            
Property, Plant and Equipment [Line Items]            
Proceeds from sale of property, plant and equipment $ 142,400          
Percentage of proceeds received   10.00%        
Pre-tax gain at close $ 108,100