Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	4,901	5,743
Average price per share	$ 231.81	$ 150.86
Total investment	$ 1,136,139	$ 866,398