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Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Options Outstanding  
Number Outstanding (in shares) 9,689
Weighted Average Remaining Contractual Life 3 years 6 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 4.09
Aggregate Intrinsic value (in dollars) $ 1,430
Options Exercisable  
Number Exercisable (in shares) 6,570
Weighted Average Remaining Contractual Life 2 years 6 months
Weighted Average Exercise Price (in dollars per share) $ 4.15
Aggregate Intrinsic value (in dollars) 1,362
$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) 2,683
Weighted Average Remaining Contractual Life 2 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 2.63
Aggregate Intrinsic value (in dollars) 1,430
Options Exercisable  
Number Exercisable (in shares) 1,807
Weighted Average Remaining Contractual Life 2 years 3 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 2.40
Aggregate Intrinsic value (in dollars) $ 1,362
$3.24 - $4.20
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.24
High end of the range (in dollars per share) $ 4.20
Options Outstanding  
Number Outstanding (in shares) 2,439
Weighted Average Remaining Contractual Life 4 years 4 months 28 days
Weighted Average Exercise Price (in dollars per share) $ 3.78
Options Exercisable  
Number Exercisable (in shares) 1,374
Weighted Average Remaining Contractual Life 3 years 9 months 7 days
Weighted Average Exercise Price (in dollars per share) $ 3.76
$4.21 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 4.21
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,627
Weighted Average Remaining Contractual Life 3 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 4.90
Options Exercisable  
Number Exercisable (in shares) 2,625
Weighted Average Remaining Contractual Life 2 years 4 days
Weighted Average Exercise Price (in dollars per share) $ 5.04
$5.62 - $6.50
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.62
High end of the range (in dollars per share) $ 6.50
Options Outstanding  
Number Outstanding (in shares) 940
Weighted Average Remaining Contractual Life 2 years 7 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 5.98
Options Exercisable  
Number Exercisable (in shares) 764
Weighted Average Remaining Contractual Life 2 years 3 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 5.98