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Stock-Based Compensation (Schedule of Stock Options Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Number Of Shares  
Balance outstanding at beginning of period, in shares 7,483
Granted, in shares 345
Foreited or expired, in shares (493)
Exercised, in shares (353)
Balance outstanding at end of period, in shares 6,982
Exercisable, in shares 5,017
Vested and expected to vest, in shares 6,669
Weighted Average Exercise Price  
Balance outstanding at beginning of period, in dollars per share $ 2.58
Granted, in dollars per share $ 2.76
Forfeited or expired, in dollars per share $ 3.60
Exercised, in dollars per share $ 1.87
Balance outstanding at end of period, in dollars per share $ 2.56
Exercisable, in dollars per share $ 2.53
Vested and expected to vest, in dollars per share $ 2.55
Weighted Average Remaining Term  
Balance outstanding 6 years
Exercisable 5 years 0 months 22 days
Vested and expected to vest 5 years 10 months 17 days
Aggregate Intrinsic Value  
Balance outstanding $ 3,114
Exercisable 2,683
Vested and expected to vest $ 3,065