Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory, Net    
Finished products and work in process $ 201,784 $ 222,940
Raw materials 47,878 58,005
Inventories, net 249,662 280,945
Valued at lower of cost or market:    
LIFO basis 145,314 168,935
Valued at lower of cost and net realizable value:    
FIFO or average cost basis 104,348 112,010
Inventories, net $ 249,662 $ 280,945