CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Revenue	$ 344,287	$ 323,566	$ 1,039,816	$ 997,333
Cost of products sold	229,216	217,920	697,538	677,580
Selling and administrative expenses	68,113	64,491	212,670	201,912
Operating income	46,958	41,155	129,608	117,841
Interest expense	3,037	3,497	9,792	11,412
Earnings before income taxes	43,921	37,658	119,816	106,429
Income taxes	10,009	4,748	28,300	22,126
Net earnings	$ 33,912	$ 32,910	$ 91,516	$ 84,303
Weighted average number of common shares outstanding:
Basic (in shares)	42,024	42,307	42,140	42,299
Diluted (in shares)	42,206	42,349	42,287	42,326
Earnings per common share:
Basic (in dollars per share)	$ 0.81	$ 0.78	$ 2.17	$ 1.99
Diluted (in dollars per share)	0.80	0.78	2.16	1.99
Dividends declared per common share (in dollars per share)	$ 0.39	$ 0.39	$ 1.17	$ 1.17