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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment      
Property, Plant and Equipment $ (386,641) $ (382,768)  
Accumulated Depreciation, Property, Plant and Equipment prior to Assets Held for Sale 223,194 202,750  
Property, Plant and Equipment, Net 163,447 180,018  
Depreciation expense 32,291 26,199 $ 17,891
Land      
Property, Plant and Equipment      
Property, Plant and Equipment (17,857) (18,152)  
Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment (93,729) (96,230)  
Machinery and manufacturing equipment      
Property, Plant and Equipment      
Property, Plant and Equipment (154,118) (151,645)  
Office equipment      
Property, Plant and Equipment      
Property, Plant and Equipment (111,219) (107,312)  
Work in progress      
Property, Plant and Equipment      
Property, Plant and Equipment $ (9,718) $ (9,429)