CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Revenue	$ 359,702	$ 350,677
Cost of products sold	244,089	238,784
Selling and administrative expenses	68,716	77,332
Operating income	46,897	34,561
Interest expense	3,433	4,307
Earnings (loss) before income taxes	43,464	30,254
Income taxes	11,796	9,481
Net earnings	$ 31,668	$ 20,773
Weighted average number of common shares outstanding:
Basic (in shares)	42,263	42,284
Diluted (in shares)	42,389	42,307
Earnings per common share:
Basic (in dollars per share)	$ 0.75	$ 0.49
Diluted (in dollars per share)	0.75	0.49
Dividends declared per common share (in dollars per share)	$ 0.39	$ 0.39