Stock-Based Awards And Other Equity Instruments (Summary Of Restricted Stock Units Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Stock-Based Awards And Other Equity Instruments [Abstract]
Restricted Stock Units, Balance as of January 1	2,317	[1]	3,283	[1]	4,523	[1]
Granted	221	[1]	263	[1]	494	[1]
Vested and released	(832)	[1]	(950)	[1]	(1,181)	[1]
Cancelled	(137)	[1]	(279)	[1]	(553)	[1]
Adjustments due to the spin-off	725	[1],[2]
Vested and released - post spin-off	(12)	[1]
Restricted Stock Units, Balance as of December 31	2,282	[1],[3]	2,317	[1]	3,283	[1]
Weighted Average Grant-Date Fair Value, Balance as of January 1	$ 40.24		$ 39.00		$ 42.82
Granted	$ 52.35		$ 52.42		$ 18.20
Vested and released	$ 39.32		$ 34.58		$ 43.38
Cancelled	$ 41.98		$ 41.76		$ 42.02
Vested and released - post spin-off	$ 13.45
Weighted Average Grant-Date Fair Value, Balance as of December 31	$ 21.47	[3]	$ 40.24		$ 39.00

[1] Reflects the one-for-two reverse stock split on December 20, 2011.

[2] Reflects the equitable adjustment to the number of unvested RSUs necessary to maintain the fair value of those awards immediately prior to and following the spin-off.

[3] Outstanding RSUs as of December 31, 2011 represent RSUs outstanding after giving effect to one-for-two reverse stock split and spin-off adjustments made in order to maintain the fair value of those awards immediately prior to and immediately following the transaction.