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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory at FIFO    
Finished products $ 33,931 $ 24,100
Materials and work in process 65,988 75,317
Gross inventories 99,919 99,417
Less: LIFO reserve (44,716) (42,542)
Less: excess and obsolescence reserve (3,034) (2,340)
Net inventories $ 52,169 $ 54,535