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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Raw materials $ 497,604 $ 467,912
Work in progress 152,360 162,670
Finished Goods 304,760 280,051
Subtotal 954,724 910,633
Less reserves (118,920) (104,492)
Total $ 835,804 $ 806,141
Percentage of LIFO Inventory 4.00% 8.00%