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Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Options Outstanding  
Number Outstanding (in shares) 9,640
Weighted Average Remaining Contractual Life 3 years 8 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 4.08
Aggregate Intrinsic value (in dollars) $ 7,329
Options Exercisable  
Number Exercisable (in shares) 6,285
Weighted Average Remaining Contractual Life 2 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 4.13
Aggregate Intrinsic value (in dollars) 5,094
$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) 2,735
Weighted Average Remaining Contractual Life 3 years 14 days
Weighted Average Exercise Price (in dollars per share) $ 2.60
Aggregate Intrinsic value (in dollars) 5,313
Options Exercisable  
Number Exercisable (in shares) 1,789
Weighted Average Remaining Contractual Life 2 years 5 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 2.33
Aggregate Intrinsic value (in dollars) 3,948
$3.24 - $4.25
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.24
High end of the range (in dollars per share) $ 4.25
Options Outstanding  
Number Outstanding (in shares) 2,565
Weighted Average Remaining Contractual Life 4 years 1 month 17 days
Weighted Average Exercise Price (in dollars per share) $ 3.81
Aggregate Intrinsic value (in dollars) 1,866
Options Exercisable  
Number Exercisable (in shares) 1,508
Weighted Average Remaining Contractual Life 4 years
Weighted Average Exercise Price (in dollars per share) $ 3.83
Aggregate Intrinsic value (in dollars) 1,074
$4.26 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 4.26
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,400
Weighted Average Remaining Contractual Life 4 years 2 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 4.94
Aggregate Intrinsic value (in dollars) 150
Options Exercisable  
Number Exercisable (in shares) 2,269
Weighted Average Remaining Contractual Life 2 years
Weighted Average Exercise Price (in dollars per share) $ 5.15
Aggregate Intrinsic value (in dollars) $ 72
$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 10 months 13 days
Weighted Average Exercise Price (in dollars per share) $ 5.98
Options Exercisable  
Number Exercisable (in shares) 719
Weighted Average Remaining Contractual Life 2 years 7 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 5.98