Stockholders' Equity (Summary Of Information About Stock Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
$0.52 To $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, minimum	$ 0.52
Range of Exercise Price, maximum	$ 10.00
$10.01 To $12.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, minimum	$ 10.01
Range of Exercise Price, maximum	$ 12.50
$12.51 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, minimum	$ 12.51
Range of Exercise Price, maximum	$ 15.00
$15.01 To $33.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, minimum	$ 15.01
Range of Exercise Price, maximum	$ 33.00
Options Outstanding [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	25,068,812
Options Outstanding [Member] | $0.52 To $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	6,545,064
Options Outstanding, Weighted-Average Remaining Contractual Life (In Years)	6.34
Options Outstanding, Weighted-Average Exercise Price	$ 3.68
Options Outstanding [Member] | $10.01 To $12.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	6,617,214
Options Outstanding, Weighted-Average Remaining Contractual Life (In Years)	3.96
Options Outstanding, Weighted-Average Exercise Price	$ 10.96
Options Outstanding [Member] | $12.51 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	2,320,924
Options Outstanding, Weighted-Average Remaining Contractual Life (In Years)	3.82
Options Outstanding, Weighted-Average Exercise Price	$ 13.03
Options Outstanding [Member] | $15.01 To $33.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	9,585,610
Options Outstanding, Weighted-Average Remaining Contractual Life (In Years)	8.32
Options Outstanding, Weighted-Average Exercise Price	$ 28.18
Options Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Exercisable	17,017,555
Options Exercisable [Member] | $0.52 To $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Exercisable	5,160,920
Options Exercisable, Weighted-Average Exercise Price	$ 4.19
Options Exercisable [Member] | $10.01 To $12.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Exercisable	6,526,235
Options Exercisable, Weighted-Average Exercise Price	$ 10.96
Options Exercisable [Member] | $12.51 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Exercisable	2,055,903
Options Exercisable, Weighted-Average Exercise Price	$ 12.87
Options Exercisable [Member] | $15.01 To $33.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Exercisable	3,274,497
Options Exercisable, Weighted-Average Exercise Price	$ 27.92