Debt (Schedule Of Short-term Debt) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt [Abstract]
Average during the year	$ 4,575,000
Weighted average rate during the year (in hundredths)	0.26%	0.00%	0.00%
Rate at December 31 (in hundredths)	0.23%	0.27%	0.25%