CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Revenue	$ 1,386,815	$ 1,362,265	$ 1,383,210
Cost of products sold	920,686	886,775	907,783
Selling and administrative expenses	262,751	307,684	289,818
Operating income	203,378	167,806	185,609
Interest expense	21,853	19,383	18,324
Earnings before income taxes	181,525	148,423	167,285
Income taxes	24,165	58,823	44,372
Earnings from continuing operations	157,360	89,600	122,913
Gain from discontinued operations, net of tax	0	0	3,343
Net earnings	$ 157,360	$ 89,600	$ 126,256
Basic:
Continuing operations (in dollars per share)	$ 3.71	$ 2.05	$ 2.76
Discontinued operations (in dollars per share)	0	0	0.08
Earnings per common share (in dollars per share)	3.71	2.05	2.84
Diluted:
Continuing operations (in dollars per share)	3.70	2.03	2.74
Discontinued operations (in dollars per share)	0	0	0.07
Diluted (in dollars per share)	$ 3.70	$ 2.03	$ 2.82
Weighted average number of common shares outstanding:
Basic (in shares)	42,404	43,780	44,523
Diluted (in shares)	42,499	44,031	44,843