Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory, Net    
Finished products and work in process $ 222,940 $ 206,188
Raw materials 58,005 58,560
Inventory, Net 280,945 264,748
Valued at lower of cost or market:    
LIFO basis 168,935 160,863
Valued at Lower of Cost and Net Realizable Value [Abstract]    
FIFO or average cost basis 112,010 103,885
Inventory, Net $ 280,945 $ 264,748