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Consolidated Statements Of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net sales $ 2,010,931 $ 2,190,295 $ 2,289,675
Cost of goods sold 1,415,899 1,560,426 1,704,312
Gross profit 595,032 629,869 585,363
Selling, general, and administrative expenses 142,863 148,083 152,400
Research, development, and testing expenses 140,367 144,465 140,289
Operating profit 311,802 337,321 292,674
Interest and financing expenses, net 26,328 29,241 26,723
Other income (expense), net 45,813 23,510 24,334
Income before income tax expense 331,287 331,590 290,285
Income tax expense 60,719 77,304 55,551
Net income $ 270,568 $ 254,286 $ 234,734
Earnings per share - basic and diluted $ 24.64 $ 22.73 $ 20.34