Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Stock Options Activity (Details)

v2.4.0.6
Stock Incentive Plan - Stock Options Activity (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Number of Options [Roll Forward]  
Beginning balance 4,778,143
Granted 0
Exercised (247,956)
Forfeited (37,950)
Ending balance 4,492,237
Options exercisable 3,117,595
Expected to vest 1,341,523
Options exercisable 3,309,722
Weighted Average Exercise Price [Roll Forward]  
Beginning balance (in usd per share) $ 6.794
Granted (in usd per share) $ 0.000
Exercised (in usd per share) $ 3.449
Forfeited (in usd per share) $ 11.982
Ending balance (in usd per share) $ 6.935
Options exercisable (in usd per share) $ 5.196
Expected to vest (in usd per share) $ 10.954
Options exercisable (in usd per share) $ 4.986