Shareholders' Equity (Schedule Of Share Repurchases) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	May 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$ 500,000
Shares repurchased, shares		1,848,144	3,655,959	1,419,163
Cost of shares repurchased		$ 174,686	$ 263,942	$ 86,700
Shares repurchased, average price per share		$ 94.52	$ 72.20	$ 61.09