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Earnings Per Share - Schedule of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Numerator:        
Net income $ 74,589 $ 66,845 $ 103,096 $ 142,112
Less: Net income attributable to participating securities (4) (10) (8) (4)
Net income attributable to Class A and Class B common stockholders $ 74,585 $ 66,835 $ 103,088 $ 142,108
Denominator:        
Denominator for basic net income per share - weighted average shares (in shares) 287,063,892 286,024,263 284,625,642 285,805,096
Effect of dilutive securities:        
Stock options     9,171,065 6,819,400
Denominator for dilutive net income per share (in shares) 297,251,349 294,586,354 293,796,707 292,624,496
Net income per share, basic (USD per share) $ 0.26 $ 0.23 $ 0.36 $ 0.50
Net income per share, diluted (USD per share) $ 0.25 $ 0.23 $ 0.35 $ 0.49