Income Taxes (Periods Subject To Examination Of Tax Returns) (Details)	12 Months Ended
	Dec. 31, 2014
South Africa [Member]
Period	2009
Poland [Member]
Period	2013
Minimum [Member] | U.S. Federal [Member]
Period	2007
Minimum [Member] | U.S. State - Colorado [Member]
Period	2005
Minimum [Member] | Canada [Member]
Period	2006
Maximum [Member] | U.S. Federal [Member]
Period	2013
Maximum [Member] | U.S. State - Colorado [Member]
Period	2013
Maximum [Member] | Canada [Member]
Period	2013