Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory, Net    
Finished products and work in process $ 102,388 $ 106,980
Raw materials 25,048 30,642
Inventory, Net 127,436 137,622
Valued at lower of cost or market:    
LIFO basis 55,283 60,190
Valued at Lower of Cost and Net Realizable Value [Abstract]    
FIFO or average cost basis 72,153 77,432
Inventory, Net $ 127,436 $ 137,622