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Income Taxes (Summary Of The Tax Years By Jurisdiction That Remain Subject To Examination By Taxing Authorities) (Details)	12 Months Ended
	Dec. 31, 2016
Minimum [Member] \| United States Federal [Member]
Tax years open	2012
Minimum [Member] \| Canada Federal [Member]
Tax years open	2003
Maximum [Member] \| United States Federal [Member]
Tax years open	2016
Maximum [Member] \| Canada Federal [Member]
Tax years open	2016
Various U.S. States [Member] \| Minimum [Member]
Tax years open	2010
Various U.S. States [Member] \| Maximum [Member]
Tax years open	2016
Various Canadian Provinces [Member] \| Minimum [Member]
Tax years open	2003
Various Canadian Provinces [Member] \| Maximum [Member]
Tax years open	2016