Reportable Segment Information (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Reportable Segment Information (Additional Textual) [Abstract]
Export sales and sales to individual customer	Less than 10 % of consolidated sales to unaffiliated customers
Consolidated Totals [Member]
Reportable Segment Information (Textual) [Abstract]
Net external sales	$ 501,800,000	$ 470,000,000
Segment profit	34,800,000	27,400,000
Long-lived assets	662,200,000	662,500,000
Consumer Group [Member]
Reportable Segment Information (Textual) [Abstract]
Mark-up on intersegment transfers realized as a result of external sales included in segment profit	$ 6,676,000	$ 4,948,000