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Stock-Based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Options Outstanding  
Number Outstanding (in shares) 10,749
Weighted Average Remaining Contractual Life 3 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 4.12
Aggregate Intrinsic value (in dollars) $ 5,225
Options Exercisable  
Number Exercisable (in shares) 6,599
Weighted Average Remaining Contractual Life 2 years 4 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 4.24
Aggregate Intrinsic value (in dollars) 3,606
$1.50 - $3.23
  
Exercise price range  
Low end of the range (in dollars per share) $ 1.50
High end of the range (in dollars per share) $ 3.23
Options Outstanding  
Number Outstanding (in shares) 3,169
Weighted Average Remaining Contractual Life 3 years 7 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 2.56
Aggregate Intrinsic value (in dollars) 4,615
Options Exercisable  
Number Exercisable (in shares) 1,746
Weighted Average Remaining Contractual Life 2 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 2.14
Aggregate Intrinsic value (in dollars) 3,290
$3.24 - $4.35
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.24
High end of the range (in dollars per share) $ 4.35
Options Outstanding  
Number Outstanding (in shares) 2,754
Weighted Average Remaining Contractual Life 3 years 6 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 3.85
Aggregate Intrinsic value (in dollars) 610
Options Exercisable  
Number Exercisable (in shares) 1,686
Weighted Average Remaining Contractual Life 2 years 11 months 16 days
Weighted Average Exercise Price (in dollars per share) $ 3.91
Aggregate Intrinsic value (in dollars) $ 316
$4.36 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 4.36
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,622
Weighted Average Remaining Contractual Life 4 years 3 months 14 days
Weighted Average Exercise Price (in dollars per share) $ 4.93
Options Exercisable  
Number Exercisable (in shares) 2,305
Weighted Average Remaining Contractual Life 1 year 9 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 5.18
$5.62 - $10.00
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.62
High end of the range (in dollars per share) $ 10.00
Options Outstanding  
Number Outstanding (in shares) 1,204
Weighted Average Remaining Contractual Life 2 years 7 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 6.45
Options Exercisable  
Number Exercisable (in shares) 862
Weighted Average Remaining Contractual Life 2 years 2 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 6.62