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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Property, Plant and Equipment      
Assets held-for-sale $ 2,546 $ 627 $ 0
Property, plant and equipment, gross 566,836 563,745 570,276
Less accumulated depreciation and amortization (326,181) (318,388) (309,198)
Property, plant and equipment excluding capital projects in progress, net 240,655 245,357 261,078
Capital projects in progress 10,743 9,240 15,036
Property, plant and equipment, net 251,398 254,597 276,114
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 29,251 30,034 33,234
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 196,848 198,809 214,074
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 4,831 4,826 4,767
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 335,906 $ 330,076 $ 318,201