Shareholders' Equity (Schedule Of Share Repurchases) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	May 01, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount	$ 500,000
Treasury shares reserved for issuance under stock compensation plans	3,000,000
Shares repurchased, shares		4,906,785	5,544,432	10,967,877
Cost of shares repurchased		$ 175,373	$ 174,686	$ 263,942
Shares repurchased, average price per share		$ 35.74	$ 31.51	$ 24.07