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Earnings Per Share (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |
Schedule of Earnings Per Share, Basic and Diluted | The details of basic and diluted EPS are as follows (in thousands, except per share amounts):
|  | Nine Months Ended
|  | September 30,
|  | 2019 |  | 2020
Numerator: |  |  |  |  |  |
Net income |  | $ | 66,845 |  | $ | 74,589
Less: Net income attributable to participating securities |  |  | (10) |  |  | (4)
Net income attributable to Class A and Class B common stockholders |  | $ | 66,835 |  | $ | 74,585
Denominator: |  |  |  |  |  |
Denominator for basic net income per share—weighted average shares |  |  | 286,024,263 |  |  | 287,063,892
Effect of dilutive securities |  |  | 8,562,091 |  |  | 10,187,457
Denominator for dilutive net income per share |  |  | 294,586,354 |  |  | 297,251,349
Net income per share, basic |  | $ | 0.23 |  | $ | 0.26
Net income per share, diluted |  | $ | 0.23 |  | $ | 0.25
|  | Year Ended December 31,
|  | 2018 |  | 2019
Numerator: |  |  |  |  |  |
Net income |  | $ | 142,112 |  | $ | 103,096
Less: Net income attributable to participating securities |  |  | (4) |  |  | (8)
Net income attributable to Class A and Class B common stockholders |  | $ | 142,108 |  | $ | 103,088
Denominator: |  |  |  |  |  |
Denominator for basic net income per share – weighted average shares |  |  | 285,805,096 |  |  | 284,625,642
Effect of dilutive securities: |  |  |  |  |  |
Stock options |  |  | 6,819,400 |  |  | 9,171,065
Denominator for dilutive net income per share |  |  | 292,624,496 |  |  | 293,796,707
Net income per share, basic |  | $ | 0.50 |  | $ | 0.36
Net income per share, diluted |  | $ | 0.49 |  | $ | 0.35

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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