Share Repurchase Program (Schedule Of Shares Repurchased) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	2,542	1,534	4,564	6,548
Average price per share	$ 152.42	$ 120.71	$ 150.55	$ 104.93
Total investment	$ 387,461	$ 185,226	$ 687,086	$ 687,064