Stock-Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Stock-Based Compensation price range information
Number of outstanding options	8,073
Weighted average remaining life, Outstanding options	5 years 8 months 12 days
Weighted average exercise price, Outstanding options	$ 6.09
Number of exercisable options	5,664
Weighted average exercise price, Exercisable options	$ 6.72
$0 to $3 [Member]
Stock-Based Compensation price range information
Lower limit	$ 0
Upper limit	$ 3
Number of outstanding options	1,024
Weighted average remaining life, Outstanding options	5 years 4 months 24 days
Weighted average exercise price, Outstanding options	$ 1.55
Number of exercisable options	943
Weighted average exercise price, Exercisable options	$ 1.50
$3 to $6 [Member]
Stock-Based Compensation price range information
Lower limit	$ 3
Upper limit	$ 6
Number of outstanding options	3,510
Weighted average remaining life, Outstanding options	7 years 3 months 18 days
Weighted average exercise price, Outstanding options	$ 4.19
Number of exercisable options	1,448
Weighted average exercise price, Exercisable options	$ 3.88
$6 to $9 [Member]
Stock-Based Compensation price range information
Lower limit	$ 6
Upper limit	$ 9
Number of outstanding options	2,082
Weighted average remaining life, Outstanding options	4 years 7 months 6 days
Weighted average exercise price, Outstanding options	$ 7.37
Number of exercisable options	1,829
Weighted average exercise price, Exercisable options	$ 7.46
$9 to $12 [Member]
Stock-Based Compensation price range information
Lower limit	$ 9
Upper limit	$ 12
Number of outstanding options	640
Weighted average remaining life, Outstanding options	3 years 8 months 12 days
Weighted average exercise price, Outstanding options	$ 11.36
Number of exercisable options	640
Weighted average exercise price, Exercisable options	$ 11.36
$12 to $15 [Member]
Stock-Based Compensation price range information
Lower limit	$ 12
Upper limit	$ 15
Number of outstanding options	811
Weighted average remaining life, Outstanding options	3 years 4 months 24 days
Weighted average exercise price, Outstanding options	$ 12.54
Number of exercisable options	798
Weighted average exercise price, Exercisable options	$ 12.54
$15 to $18 [Member]
Stock-Based Compensation price range information
Lower limit	$ 15
Upper limit	$ 18
Number of outstanding options	4
Weighted average remaining life, Outstanding options	3 years
Weighted average exercise price, Outstanding options	$ 15.45
Number of exercisable options	4
Weighted average exercise price, Exercisable options	$ 15.45
$18 to $21 [Member]
Stock-Based Compensation price range information
Lower limit	$ 18
Upper limit	$ 21
Number of outstanding options	2
Weighted average remaining life, Outstanding options	2 months 12 days
Weighted average exercise price, Outstanding options	$ 18.99
Number of exercisable options	2
Weighted average exercise price, Exercisable options	$ 18.99
$0 to $21 [Member]
Stock-Based Compensation price range information
Lower limit	$ 0
Upper limit	$ 21