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Property, Plant and Equipment, and Leases - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, plant and equipment   $ 46,100 $ 35,735
Asset retirement obligation $ 1,300    
Rent expense under operating leases   5,100 4,700
Capital lease obligation   400  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Purchase price 5,600    
Property, plant and equipment $ 6,900 $ 38,454 $ 27,379