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Stock-Based Compensation (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Unrecognized stock-based compensation expense  
Unrecognized stock compensation expense $ 14,284
Weighted average remaining period 2 years 9 months 29 days
Employee stock options
 
Unrecognized stock-based compensation expense  
Unrecognized stock compensation expense 14,125
Weighted average remaining period 2 years 10 months 6 days
Restricted stock
 
Unrecognized stock-based compensation expense  
Unrecognized stock compensation expense $ 159
Weighted average remaining period 8 months 19 days