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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	1,147	2,542	3,784	4,564
Average price per share	$ 238.97	$ 152.42	$ 224.39	$ 150.55
Total investment	$ 274,213	$ 387,461	$ 849,145	$ 687,086