Stock-Based Compensation (Summary Of Stock Options Outstanding By Exercise Price Range) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	6,404,539
Options Outstanding, Weighted Average Exercise Price	$ 1.87
Options Exercisable	6,404,539
Options Exercisable, Weighted Average Exercise Price Per Share	$ 1.87
Range Of Exercise Price, $0.66 - $0.66 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 0.66
Options Outstanding Exercise Price, Upper range limit	$ 0.66
Options Outstanding	4,611,481
Options Outstanding, Weighted Average Exercise Price	$ 0.66
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 6 months 29 days
Options Exercisable	4,611,481
Options Exercisable, Weighted Average Exercise Price Per Share	$ 0.66
Range Of Exercise Price, $1.41 - $1.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 1.41
Options Outstanding Exercise Price, Upper range limit	$ 1.55
Options Outstanding	50,000
Options Outstanding, Weighted Average Exercise Price	$ 1.41
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 6 months 29 days
Options Exercisable	50,000
Options Exercisable, Weighted Average Exercise Price Per Share	$ 1.41
Range Of Exercise Price, $1.62 - $2.89 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 1.62
Options Outstanding Exercise Price, Upper range limit	$ 2.89
Options Outstanding	817,136
Options Outstanding, Weighted Average Exercise Price	$ 2.58
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 6 months
Options Exercisable	817,136
Options Exercisable, Weighted Average Exercise Price Per Share	$ 2.58
Range Of Exercise Price, $3.19 - $6.88 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 3.19
Options Outstanding Exercise Price, Upper range limit	$ 6.88
Options Outstanding	675,228
Options Outstanding, Weighted Average Exercise Price	$ 6.47
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 9 months 29 days
Options Exercisable	675,228
Options Exercisable, Weighted Average Exercise Price Per Share	$ 6.47
Range Of Exercise Price, $7.10 - $9.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 7.10
Options Outstanding Exercise Price, Upper range limit	$ 9.67
Options Outstanding	225,694
Options Outstanding, Weighted Average Exercise Price	$ 9.43
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 10 months 17 days
Options Exercisable	225,694
Options Exercisable, Weighted Average Exercise Price Per Share	$ 9.43
Range Of Exercise Price, $10.51 - $10.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Exercise Price, Lower range limit	$ 10.51
Options Outstanding Exercise Price, Upper range limit	$ 10.51
Options Outstanding	25,000
Options Outstanding, Weighted Average Exercise Price	$ 10.51
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 7 months 2 days
Options Exercisable	25,000
Options Exercisable, Weighted Average Exercise Price Per Share	$ 10.51