CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Condensed Statements of Earnings (Unaudited)
Revenue	$ 365,660	$ 349,686
Cost of products sold	250,328	241,979
Selling and administrative expenses	68,843	64,110
Operating income	46,489	43,597
Interest expense	4,406	4,850
Earnings (loss) before income taxes	42,083	38,747
Income taxes	13,177	12,332
Net earnings	$ 28,906	$ 26,415
Average number of common shares outstanding:
Basic (in shares)	49,795	49,637
Diluted (in shares)	50,016	49,818
Earnings per common share:
Basic (in dollars per share)	$ 0.58	$ 0.53
Diluted (in dollars per share)	$ 0.58	$ 0.53
Dividends per common share (in dollars per share)	$ 0.21	$ 0.21