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Consolidated Statements Of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 509,927 $ 559,566
Cost of goods sold 334,377 378,294
Gross profit 175,550 181,272
Selling, general, and administrative expenses 40,940 41,809
Research, development, and testing expenses 39,216 39,685
Operating profit 95,394 99,778
Interest and financing expenses, net 4,188 3,816
Other income (expense), net (2,260) (2,325)
Income before income tax expense 88,946 93,637
Income tax expense 27,015 29,690
Net income $ 61,931 $ 63,947
Earnings per share - basic and diluted (in dollars per share) $ 5.22 $ 5.14
Cash dividends declared per share (in dollars per share) $ 1.60 $ 1.40