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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Land and improvements $ 57,452 $ 66,670
Buildings and improvements, gross 291,373 310,797
Machinery and equipment, gross 1,228,381 1,204,457
Construction in progress, gross 87,228 161,951
Property, Plant and Equipment, Gross 1,664,434 1,743,875
Accumulated depreciation (779,858) (755,598)
Property, plant and equipment, net $ 884,576 $ 988,277