CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 338,475	$ 360,836	$ 679,872	$ 703,304
Cost of products sold	219,250	236,402	439,702	463,027
Selling and administrative expenses	74,845	80,769	171,753	149,093
Operating income	44,380	43,665	68,417	91,184
Interest expense	4,717	4,637	9,528	9,437
Earnings before income taxes	39,663	39,028	58,889	81,747
Income taxes	8,889	14,277	14,923	25,803
Earnings from continuing operations	30,774	24,751	43,966	55,944
Gain from discontinued operations, net of tax	0	3,365	0	3,343
Net earnings	$ 30,774	$ 28,116	$ 43,966	$ 59,287
Weighted average number of shares outstanding:
Basic (in shares)	44,023	44,562	44,112	44,640
Diluted (in shares)	44,290	44,822	44,384	44,902
Basic:
Continuing operations (in dollars per share)	$ 0.70	$ 0.56	$ 1.00	$ 1.25
Discontinued operations (in dollars per share)	0	0.08	0	0.07
Earnings per common share (in dollars per share)	0.70	0.63	1.00	1.33
Diluted:
Continuing operations (in dollars per share)	0.69	0.55	0.99	1.25
Discontinued operations (in dollars per share)	0	0.08	0	0.07
Earnings per common share (in dollars per share)	0.69	0.63	0.99	1.32
Dividends declared per common share (in dollars per share)	$ 0.30	$ 0.27	$ 0.60	$ 0.54