CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 353,519	$ 349,662	$ 1,033,391	$ 1,052,966
Cost of products sold	230,784	227,099	670,486	690,126
Selling and administrative expenses	70,725	71,412	242,478	220,505
Operating income	52,010	51,151	120,427	142,335
Interest expense	4,946	4,584	14,474	14,021
Earnings before income taxes	47,064	46,567	105,953	128,314
Income taxes	14,851	10,948	29,774	36,751
Earnings from continuing operations	32,213	35,619	76,179	91,563
Gain from discontinued operations, net of tax	0	0	0	3,343
Net earnings	$ 32,213	$ 35,619	$ 76,179	$ 94,906
Weighted average number of shares outstanding:
Basic (in shares)	43,624	44,532	43,947	44,604
Diluted (in shares)	43,864	44,816	44,209	44,873
Basic:
Continuing operations (in dollars per share)	$ 0.74	$ 0.80	$ 1.73	$ 2.05
Discontinued operations (in dollars per share)	0	0	0	0.07
Earnings per common share (in dollars per share)	0.74	0.80	1.73	2.13
Diluted:
Continuing operations (in dollars per share)	0.73	0.79	1.72	2.04
Discontinued operations (in dollars per share)	0	0	0	0.07
Earnings per common share (in dollars per share)	0.73	0.79	1.72	2.11
Dividends declared per common share (in dollars per share)	$ 0.30	$ 0.27	$ 0.90	$ 0.81