CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Revenue	$ 1,362,265	$ 1,383,210	$ 1,375,964
Cost of products sold	886,775	907,783	921,531
Selling and administrative expenses	307,684	289,818	288,092
Operating income	167,806	185,609	166,341
Interest expense	19,383	18,324	16,945
Earnings before income taxes	148,423	167,285	149,396
Income taxes	58,823	44,372	42,149
Earnings from continuing operations	89,600	122,913	107,247
Gain (Loss) from discontinued operations, net of tax	0	3,343	(462)
Net earnings	$ 89,600	$ 126,256	$ 106,785
Basic:
Continuing operations (in dollars per share)	$ 2.05	$ 2.76	$ 2.34
Discontinued operations (in dollars per share)	0	0.08	(0.01)
Earnings per common share (in dollars per share)	2.05	2.84	2.33
Diluted:
Continuing operations (in dollars per share)	2.03	2.74	2.32
Discontinued operations (in dollars per share)	0	0.07	(0.01)
Earnings per common share (in dollars per share)	$ 2.03	$ 2.82	$ 2.31
Weighted average number of common shares outstanding:
Basic (in shares)	43,780	44,523	45,910
Diluted (in shares)	44,031	44,843	46,204