CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Condensed Statements of Earnings (Unaudited)
Revenue	$ 367,777	$ 376,994	$ 733,437	$ 726,680
Cost of products sold	247,822	257,851	498,150	499,830
Selling and administrative expenses	65,657	64,810	134,500	128,920
Operating income	54,298	54,333	100,787	97,930
Interest expense	4,347	5,135	8,753	9,985
Earnings (loss) before income taxes	49,951	49,198	92,034	87,945
Income taxes	15,046	15,712	28,223	28,044
Net earnings	$ 34,905	$ 33,486	$ 63,811	$ 59,901
Average number of common shares outstanding:
Basic (in shares)	49,537	49,753	49,656	49,696
Diluted (in shares)	49,771	49,947	49,844	49,883
Earnings per common share:
Basic (in dollars per share)	$ 0.70	$ 0.67	$ 1.29	$ 1.21
Diluted (in dollars per share)	$ 0.70	$ 0.67	$ 1.28	$ 1.20
Dividends per common share (in dollars per share)	$ 0.22	$ 0.21	$ 0.43	$ 0.42