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Stock-Based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Options Outstanding  
Number Outstanding (in shares) 10,230
Weighted Average Remaining Contractual Life 3 years 3 months 25 days
Weighted Average Exercise Price (in dollars per share) $ 4.13
Aggregate Intrinsic value (in dollars) $ 3,337
Options Exercisable  
Number Exercisable (in shares) 6,448
Weighted Average Remaining Contractual Life 2 years 6 months 11 days
Weighted Average Exercise Price (in dollars per share) $ 4.41
Aggregate Intrinsic value (in dollars) 2,237
$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) 2,715
Weighted Average Remaining Contractual Life 3 years 7 months 28 days
Weighted Average Exercise Price (in dollars per share) $ 2.33
Aggregate Intrinsic value (in dollars) 3,124
Options Exercisable  
Number Exercisable (in shares) 1,421
Weighted Average Remaining Contractual Life 2 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 1.93
Aggregate Intrinsic value (in dollars) 2,199
$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) 2,864
Weighted Average Remaining Contractual Life 4 years 5 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 3.62
Aggregate Intrinsic value (in dollars) 213
Options Exercisable  
Number Exercisable (in shares) 1,159
Weighted Average Remaining Contractual Life 3 years 8 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 3.69
Aggregate Intrinsic value (in dollars) $ 38
$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) 3,172
Weighted Average Remaining Contractual Life 2 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 4.97
Options Exercisable  
Number Exercisable (in shares) 2,828
Weighted Average Remaining Contractual Life 2 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 5.02
$5.62 - $9.81
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.62
High end of the range (in dollars per share) $ 9.81
Options Outstanding  
Number Outstanding (in shares) 1,479
Weighted Average Remaining Contractual Life 2 years 7 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 6.66
Options Exercisable  
Number Exercisable (in shares) 1,040
Weighted Average Remaining Contractual Life 1 year 10 months 28 days
Weighted Average Exercise Price (in dollars per share) $ 6.93