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Property, Plant and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment      
Asset impairment expense $ 100,000 $ 96,900,000 $ 15,300,000
Other Current Assets      
Property, Plant and Equipment      
Net book value of assets held for sale $ 25,000,000 $ 0