Income Taxes (Periods Subject To Examination Of Tax Returns) (Details)	12 Months Ended
	Dec. 31, 2018
United Kingdom [Member]
Period	2017
Minimum [Member] | US Federal [Member]
Period	2007
Minimum [Member] | US State - Colorado [Member]
Period	2007
Minimum [Member] | Canada [Member]
Period	2006
Minimum [Member] | Mauritius [Member]
Period	2015
Minimum [Member] | Poland [Member]
Period	2013
Minimum [Member] | Austria [Member]
Period	2013
Maximum [Member] | US Federal [Member]
Period	2017
Maximum [Member] | US State - Colorado [Member]
Period	2017
Maximum [Member] | Canada [Member]
Period	2017
Maximum [Member] | Mauritius [Member]
Period	2017
Maximum [Member] | Poland [Member]
Period	2017
Maximum [Member] | Austria [Member]
Period	2017