CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Revenue	$ 1,322,934	$ 1,386,815	$ 1,362,265
Cost of products sold	908,061	920,686	886,775
Selling and administrative expenses	293,763	262,751	307,684
Operating income	121,110	203,378	167,806
Interest expense	20,107	21,853	19,383
Earnings before income taxes	101,003	181,525	148,423
Income taxes	18,956	24,165	58,823
Net earnings	$ 82,047	$ 157,360	$ 89,600
Earnings per common share:
Basic (in dollars per share)	$ 1.94	$ 3.71	$ 2.05
Diluted (in dollars per share)	$ 1.94	$ 3.70	$ 2.03
Weighted average number of common shares outstanding:
Basic (in shares)	42,263	42,404	43,780
Diluted (in shares)	42,294	42,499	44,031