Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	367	1,147	3,673	3,784
Average price per share	$ 281.04	$ 238.97	$ 261.32	$ 224.39
Total investment	$ 102,941	$ 274,213	$ 959,743	$ 849,145