Income Taxes (Periods Subject To Examination Of Tax Returns) (Details)	12 Months Ended
	Dec. 31, 2017
Minimum [Member] | U.S. Federal [Member]
Period	2007
Minimum [Member] | U.S. State - Colorado [Member]
Period	2005
Minimum [Member] | Canada [Member]
Period	2011
Minimum [Member] | Mauritius [Member]
Period	2014
Minimum [Member] | Poland [Member]
Period	2009
Minimum [Member] | Austria [Member]
Period	2012
Maximum [Member] | U.S. Federal [Member]
Period	2016
Maximum [Member] | U.S. State - Colorado [Member]
Period	2016
Maximum [Member] | Canada [Member]
Period	2016
Maximum [Member] | Mauritius [Member]
Period	2016
Maximum [Member] | Poland [Member]
Period	2016
Maximum [Member] | Austria [Member]
Period	2016