Repurchases of Common Stock (Summary Of Authorized Stock Repurchases) (Details) (USD $)	3 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014		Sep. 30, 2014 Open Market Share Repurchase [Member]	Jan. 30, 2014 Open Market Share Repurchase [Member]	Jan. 30, 2014 Tender Offer [Member]	Sep. 30, 2014 Tender Offer [Member]
Accelerated Share Repurchases [Line Items]
Repurchase of common stock (in shares)				2,633,526			5,291,701
Summary Of Authorized Stock Repurchases [Roll Forward]
Authorized repurchase - as of January 1, 2013		$ 201,291,000	[1]
Additional board authorization					500,000,000	350,000,000.0
Proceeds from the exercise of stock options	153,000	2,943,000
Repurchases of common stock	(70,587,000)	(545,156,000)		(170,582,000)			(370,789,000)	[2]
Authorized repurchase	$ 162,863,000	$ 162,863,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Option to Increase Repurchase Amount, Percentage of Outstanding Shares						2.00%

[1] In addition to these amounts, the repurchase program approved by our Board of Directors allows for the use of cash proceeds received from the exercise of stock options by our officers, directors, and employees.

[2] Excludes expenses of $3.8 million associated with the tender offer.