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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Inventory Disclosure [Abstract]      
Raw materials $ 263,580 $ 270,066 $ 261,058
Work-in-process 167,137 167,100 148,034
Finished goods 452,553 335,346 432,085
Other 14,955 14,610 13,126
Inventories, gross 898,225 787,122 854,303
Adjustment to value inventory at cost on the LIFO method (109,588) (109,588) (156,495)
Inventories $ 788,637 $ 677,534 $ 697,808