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Share-based Compensation (Details 2) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restricted Stock information    
Recognized compensation costs (in dollars) $ 3,218,000 $ 4,471,000
Unrecognized compensation costs related to unvested options and RSUs (in dollars) 24,700,000  
Weighted average remaining vesting period for recognition of compensation costs 2 years 8 months 12 days  
Restricted Stock Units
   
Restricted Stock information    
Restricted stock units (RSUs) granted in period (in shares) 644,677  
Fair value of restricted stock granted during the period (in dollars) 4,100,000  
Vesting period 3 years  
Vesting subject to the grantees continued employment or providing service and reduction if the aggregate fair value of each grant exceeds a specified percentage of our Adjusted EBITDA (in shares) 212,384  
Vesting subject to the grantees continued employment or providing service and certain revenue and Adjusted EBITDA growth targets (in shares) 432,293  
Restricted Stock Units | Director
   
Restricted Stock information    
Restricted stock units (RSUs) granted in period (in shares) 84,622  
Fair value of restricted stock granted during the period (in dollars) $ 600,000  
Restricted Stock Units | Director | Minimum
   
Restricted Stock information    
Vesting period 1 year  
Restricted Stock Units | Director | Maximum
   
Restricted Stock information    
Vesting period 3 years