Employee And Non-Employee Benefit And Compensation Plans (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012
$1.96 - $12.00 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 1.96
Range of exercise price, upper range limit	$ 12
Weighted average remaining contractual life in years	6 years
Shares subject to options outstanding, number outstanding	6,211,684
Shares subject to options outstanding, weighted average exercise price	$ 5.45
Shares subject to options exercisable, number exercisable	3,528,568
Shares subject to options exercisable, weighted average exercise price	$ 5.54
$14.90 - $15.75 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 14.90
Range of exercise price, upper range limit	$ 15.75
$15.90 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, upper range limit	$ 15.90
$16.45 - $18.90 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 16.45
Range of exercise price, upper range limit	$ 18.90
Weighted average remaining contractual life in years	1 year 10 months 24 days
Shares subject to options outstanding, number outstanding	415,000
Shares subject to options outstanding, weighted average exercise price	$ 18.54
Shares subject to options exercisable, number exercisable	415,000
Shares subject to options exercisable, weighted average exercise price	$ 18.54
$19.92 - $26.25 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 19.92
Range of exercise price, upper range limit	$ 26.25
Weighted average remaining contractual life in years	2 years 9 months 18 days
Shares subject to options outstanding, number outstanding	200,000
Shares subject to options outstanding, weighted average exercise price	$ 20.35
Shares subject to options exercisable, number exercisable	200,000
Shares subject to options exercisable, weighted average exercise price	$ 20.35
$26.25 - $33.75 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 26.56
Range of exercise price, upper range limit	$ 33.75
Weighted average remaining contractual life in years	2 years 1 month 6 days
Shares subject to options outstanding, number outstanding	200,000
Shares subject to options outstanding, weighted average exercise price	$ 28.55
Shares subject to options exercisable, number exercisable	200,000
Shares subject to options exercisable, weighted average exercise price	$ 28.55
$1.96 - $33.75 exercise price per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, lower range limit	$ 1.96
Range of exercise price, upper range limit	$ 33.75
Weighted average remaining contractual life in years	5 years 7 months 6 days
Shares subject to options outstanding, number outstanding	7,026,684
Shares subject to options outstanding, weighted average exercise price	$ 7.31
Shares subject to options exercisable, number exercisable	4,343,568
Shares subject to options exercisable, weighted average exercise price	$ 8.52