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Stock-Based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Options Outstanding  
Number Outstanding (in shares) 10,750
Weighted Average Remaining Contractual Life 3 years 6 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 4.05
Aggregate Intrinsic value (in dollars) $ 4,247
Options Exercisable  
Number Exercisable (in shares) 6,626
Weighted Average Remaining Contractual Life 3 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 4.28
Aggregate Intrinsic value (in dollars) 2,813
$1.50 - $2.50
  
Exercise price range  
Low end of the range (in dollars per share) $ 1.50
High end of the range (in dollars per share) $ 2.50
Options Outstanding  
Number Outstanding (in shares) 2,655
Weighted Average Remaining Contractual Life 2 years 5 months 16 days
Weighted Average Exercise Price (in dollars per share) $ 1.73
Aggregate Intrinsic value (in dollars) 4,004
Options Exercisable  
Number Exercisable (in shares) 1,835
Weighted Average Remaining Contractual Life 2 years 6 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 1.73
Aggregate Intrinsic value (in dollars) 2,770
$2.51 - $5.00
  
Exercise price range  
Low end of the range (in dollars per share) $ 2.51
High end of the range (in dollars per share) $ 5.00
Options Outstanding  
Number Outstanding (in shares) 4,935
Weighted Average Remaining Contractual Life 4 years 2 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 3.90
Aggregate Intrinsic value (in dollars) 243
Options Exercisable  
Number Exercisable (in shares) 2,304
Weighted Average Remaining Contractual Life 3 years 5 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 4.11
Aggregate Intrinsic value (in dollars) $ 43
$5.01 - $7.50
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.01
High end of the range (in dollars per share) $ 7.50
Options Outstanding  
Number Outstanding (in shares) 2,686
Weighted Average Remaining Contractual Life 3 years 11 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 5.88
Options Exercisable  
Number Exercisable (in shares) 2,013
Weighted Average Remaining Contractual Life 3 years 7 months 20 days
Weighted Average Exercise Price (in dollars per share) $ 5.86
$7.51 - $15.00
  
Exercise price range  
Low end of the range (in dollars per share) $ 7.51
High end of the range (in dollars per share) $ 15.00
Options Outstanding  
Number Outstanding (in shares) 474
Weighted Average Remaining Contractual Life 11 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 8.31
Options Exercisable  
Number Exercisable (in shares) 474
Weighted Average Remaining Contractual Life 11 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 8.31