Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory, Net    
Finished products and work in process $ 206,188 $ 199,919
Raw materials 58,560 62,469
Inventory, Net 264,748 262,388
Valued at lower of cost or market:    
LIFO basis 160,863 162,315
Valued at Lower of Cost and Net Realizable Value [Abstract]    
FIFO or average cost basis 103,885 100,073
Inventory, Net $ 264,748 $ 262,388