Share Repurchase Program (Schedule Of Shares Repurchased) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	1,873	2,546	2,022	5,013
Average price per share	$ 148.21	$ 107.61	$ 148.21	$ 100.10
Total investment	$ 277,561	$ 273,946	$ 299,625	$ 501,838