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Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Options Outstanding  
Number Outstanding (in shares) 9,905
Weighted Average Remaining Contractual Life 3 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 4.04
Aggregate Intrinsic value (in dollars) $ 15,165
Options Exercisable  
Number Exercisable (in shares) 6,327
Weighted Average Remaining Contractual Life 2 years 7 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 4.09
Aggregate Intrinsic value (in dollars) 9,441
$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) 2,846
Weighted Average Remaining Contractual Life 3 years 3 months 11 days
Weighted Average Exercise Price (in dollars per share) $ 2.59
Aggregate Intrinsic value (in dollars) 8,330
Options Exercisable  
Number Exercisable (in shares) 1,807
Weighted Average Remaining Contractual Life 2 years 7 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 2.30
Aggregate Intrinsic value (in dollars) 5,814
$3.24 - $4.19
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.24
High end of the range (in dollars per share) $ 4.19
Options Outstanding  
Number Outstanding (in shares) 2,521
Weighted Average Remaining Contractual Life 4 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 3.77
Aggregate Intrinsic value (in dollars) 4,413
Options Exercisable  
Number Exercisable (in shares) 1,355
Weighted Average Remaining Contractual Life 3 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 3.76
Aggregate Intrinsic value (in dollars) 2,387
$4.20 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 4.20
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,621
Weighted Average Remaining Contractual Life 3 years 11 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 4.88
Aggregate Intrinsic value (in dollars) 2,422
Options Exercisable  
Number Exercisable (in shares) 2,493
Weighted Average Remaining Contractual Life 1 year 11 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 5.07
Aggregate Intrinsic value (in dollars) $ 1,240
$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) 917
Weighted Average Remaining Contractual Life 2 years 11 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 5.98
Options Exercisable  
Number Exercisable (in shares) 672
Weighted Average Remaining Contractual Life 2 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 5.98