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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Property, Plant and Equipment      
Property, plant and equipment, gross $ 594,087 $ 579,592 $ 572,373
Less accumulated depreciation and amortization (360,719) (346,594) (334,293)
Property, plant and equipment excluding capital projects in progress, net 233,368 232,998 238,080
Capital projects in progress 13,751 16,014 14,630
Property, plant and equipment, net 247,119 249,012 252,710
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 28,068 28,092 29,343
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 200,205 195,210 198,129
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,817 4,911 5,016
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 359,997 $ 351,379 $ 339,885