CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 378,806	$ 367,777	$ 744,446	$ 733,437
Cost of products sold	256,285	247,822	504,788	498,150
Selling and administrative expenses	73,843	65,657	154,642	134,500
Operating income	48,678	54,298	85,016	100,787
Interest expense	4,008	4,347	8,269	8,753
Earnings before income taxes	44,670	49,951	76,747	92,034
Income taxes	12,388	15,046	23,026	28,223
Net earnings	$ 32,282	$ 34,905	$ 53,721	$ 63,811
Average number of common shares outstanding:
Basic (in shares)	49,751	49,537	49,731	49,656
Diluted (in shares)	49,917	49,771	49,892	49,884
Earnings per common share:
Basic (in dollars per share)	$ 0.65	$ 0.70	$ 1.08	$ 1.29
Diluted (in dollars per share)	$ 0.65	$ 0.70	$ 1.08	$ 1.28
Dividends per common share (in dollars per share)	$ 0.23	$ 0.22	$ 0.45	$ 0.43