CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 356,477	$ 341,397
Cost of products sold	233,406	220,452
Selling and administrative expenses	67,390	96,908
Operating income	55,681	24,037
Interest expense	5,555	4,811
Earnings before income taxes	50,126	19,226
Income taxes	11,932	6,034
Net earnings	$ 38,194	$ 13,192
Weighted average number of shares outstanding:
Basic (in shares)	42,879	44,202
Diluted (in shares)	43,034	44,479
Earnings per common share:
Basic (in dollars per share)	$ 0.89	$ 0.30
Diluted (in dollars per share)	0.89	0.30
Dividends declared per common share (in dollars per share)	$ 0.33	$ 0.30