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Property, Plant and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment    
Asset impairment expense $ 0 $ 400,000
Other Income (Expense) – Net    
Property, Plant and Equipment    
Gain on assets held for sale $ 3,500,000  
Other Current Assets    
Property, Plant and Equipment    
Assets held for sale   $ 12,900,000