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Other Balance Sheet Captions - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of Property and Equipment [Abstract]    
Land, buildings, and improvements $ 105,257 $ 90,992
Transportation equipment 3,317 3,308
Machinery and equipment 190,930 184,779
Construction in progress 14,454 16,814
Property, plant, and equipment, at cost 313,958 295,893
Less accumulated depreciation and amortization (185,539) (175,105)
Property, plant, and equipment, net $ 128,419 $ 120,788