CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 347,513	$ 356,477
Cost of products sold	232,288	233,406
Selling and administrative expenses	65,805	67,390
Operating income	49,420	55,681
Interest expense	5,402	5,555
Earnings before income taxes	44,018	50,126
Income taxes	11,211	11,932
Net earnings	$ 32,807	$ 38,194
Weighted average number of shares outstanding:
Basic (in shares)	42,239	42,879
Diluted (in shares)	42,275	43,034
Earnings per common share:
Basic (in dollars per share)	$ 0.78	$ 0.89
Diluted (in dollars per share)	0.78	0.89
Dividends declared per common share (in dollars per share)	$ 0.36	$ 0.33