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CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]        
Revenue $ 323,090 $ 339,186 $ 673,767 $ 686,699
Cost of products sold 220,876 227,418 459,660 459,706
Selling and administrative expenses 60,089 64,400 137,421 130,205
Operating income 42,125 47,368 76,686 96,788
Interest expense 3,608 5,200 7,915 10,602
Earnings before income taxes 38,517 42,168 68,771 86,186
Income taxes 7,897 7,837 17,378 19,048
Net earnings $ 30,620 $ 34,331 $ 51,393 $ 67,138
Weighted average number of common shares outstanding:        
Basic (in shares) 42,305 42,270 42,294 42,255
Diluted (in shares) 42,322 42,300 42,315 42,287
Earnings per common share:        
Basic (in dollars per share) $ 0.72 $ 0.81 $ 1.22 $ 1.59
Diluted (in dollars per share) 0.72 0.81 1.21 1.59
Dividends declared per common share (in dollars per share) $ 0.39 $ 0.36 $ 0.78 $ 0.72