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Repurchases Of Common Stock (Summary Of Authorized Stock Repurchases) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Class Of Stock Disclosures [Abstract]
Authorized repurchase - as of January 1, 2013	$ 133,640
Additional board authorization	250,000
Proceeds from the exercise of stock options	4,655
Repurchase of common stock from open market	(46,482)
Authorized repurchase - as of March 31, 2013	$ 341,813

Value of stock issued as a result of the exercise of stock options.

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.