Special Items (Schedule Of Special Items Included In The Consolidated Statements Of Income) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2010		Dec. 31, 2010		Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ (6,958,000)	[1]	$ (6,958,000)	[2]	$ (11,643,000)	[2]
Port de Bouc facility disposition charges					(12,393,000)	[3]
Total special items			(6,958,000)		(24,036,000)
Restructuring and other charges, net of tax	4,600,000
Bergheim, Germany Site [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net of tax			4,600,000
Arkansas [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net of tax					7,600,000
Port De Bouc [Member]
Restructuring Cost and Reserve [Line Items]
Port de Bouc facility disposition charges, net of tax					$ 8,200,000

[1] First quarter of 2010 results include $7.0 million in pre-tax charges ($4.6 million after income taxes) that related principally to reductions in force at our Bergheim, Germany site.

[2] The year ended December 31, 2010 included charges amounting to $7.0 million ($4.6 million after income taxes) that related principally to reductions in force at our Bergheim, Germany site. The year ended December 31, 2009 results included $11.6 million in pre-tax charges ($7.6 million after income taxes) for restructuring and other costs, related principally to reductions in force and the write-off of assets at our Arkansas facility.

[3] The year ended December 31, 2009 included charges amounting to $12.4 million ($8.2 million after income taxes) that related to the costs of the final contract settlement arising from the divestiture of our Port de Bouc, France facility to International Chemical Investors Group S.A. effective December 31, 2008.