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Consolidated Statements Of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Net sales $ 563,166 $ 548,416 $ 1,751,363 $ 1,638,422
Cost of Goods Sold 422,283 389,539 1,307,838 1,147,232
Gross profit 140,883 158,877 443,525 491,190
Selling, general, and administrative expenses 37,741 43,633 120,653 123,486
Research, development, and testing expenses 34,994 36,545 106,018 111,694
Operating profit 68,148 78,699 216,854 256,010
Interest and financing expenses, net 7,807 5,564 18,536 16,496
Other income (expense), net 7,973 3,842 20,872 10,986
Income before income tax expense 68,314 76,977 219,190 250,500
Income tax expense 9,833 17,205 47,259 64,063
Net income $ 58,481 $ 59,772 $ 171,931 $ 186,437
Earnings per share - basic and diluted (in dollars per share) $ 5.12 $ 5.04 $ 14.78 $ 15.73
Cash dividends declared per share (in dollars per share) $ 1.75 $ 1.75 $ 5.25 $ 5.25