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Stock-Based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Options Outstanding  
Number Outstanding (in shares) 10,809
Weighted Average Remaining Contractual Life 3 years 10 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 4.09
Aggregate Intrinsic value (in dollars) $ 6,515
Options Exercisable  
Number Exercisable (in shares) 6,249
Weighted Average Remaining Contractual Life 3 years 1 month 24 days
Weighted Average Exercise Price (in dollars per share) $ 4.43
Aggregate Intrinsic value (in dollars) 3,426
$1.50 - $3.09
  
Exercise price range  
Low end of the range (in dollars per share) $ 1.50
High end of the range (in dollars per share) $ 3.09
Options Outstanding  
Number Outstanding (in shares) 2,995
Weighted Average Remaining Contractual Life 3 years 9 months 14 days
Weighted Average Exercise Price (in dollars per share) $ 2.30
Aggregate Intrinsic value (in dollars) 5,224
Options Exercisable  
Number Exercisable (in shares) 1,408
Weighted Average Remaining Contractual Life 2 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 1.85
Aggregate Intrinsic value (in dollars) 3,087
$3.10 - $3.92
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.10
High end of the range (in dollars per share) $ 3.92
Options Outstanding  
Number Outstanding (in shares) 3,048
Weighted Average Remaining Contractual Life 4 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 3.62
Aggregate Intrinsic value (in dollars) 1,291
Options Exercisable  
Number Exercisable (in shares) 1,042
Weighted Average Remaining Contractual Life 3 years 11 months 16 days
Weighted Average Exercise Price (in dollars per share) $ 3.71
Aggregate Intrinsic value (in dollars) $ 339
$3.93 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.93
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,216
Weighted Average Remaining Contractual Life 3 years 5 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 4.96
Options Exercisable  
Number Exercisable (in shares) 2,756
Weighted Average Remaining Contractual Life 3 years 5 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 5.03
$5.62 - $15.00
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.62
High end of the range (in dollars per share) $ 15.00
Options Outstanding  
Number Outstanding (in shares) 1,550
Weighted Average Remaining Contractual Life 2 years 11 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 6.70
Options Exercisable  
Number Exercisable (in shares) 1,043
Weighted Average Remaining Contractual Life 2 years 2 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 7.03