Income Taxes (Remaining Tax Years Subject to Examination) (Details)	12 Months Ended
	Dec. 31, 2011
United States [Member]
Remaining tax years subject to examination	2008 to 2011
United Kingdom [Member]
Remaining tax years subject to examination	2009 to 2011
Canada [Member]
Remaining tax years subject to examination	2007 to 2011
Korea [Member]
Remaining tax years subject to examination	2006 to 2011
Australia [Member]
Remaining tax years subject to examination	2008 to 2011