CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract]
Revenue	$ 365,640	$ 365,660
Cost of products sold	248,503	250,328
Selling and administrative expenses	80,799	68,843
Operating income	36,338	46,489
Interest expense	4,261	4,406
Earnings before income taxes	32,077	42,083
Income taxes	10,638	13,177
Net earnings	$ 21,439	$ 28,906
Average number of common shares outstanding:
Basic (in shares)	49,711	49,795
Diluted (in shares)	49,867	50,016
Earnings per common share:
Basic (in dollars per share)	$ 0.43	$ 0.58
Diluted (in dollars per share)	$ 0.43	$ 0.58
Dividends per common share (in dollars per share)	$ 0.22	$ 0.21