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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 69,594 $ 87,779
Work-in-process 88,196 98,426
Raw material and supplies 74,916 79,785
Inventories $ 232,706 $ 265,990