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Net Income Per Share of Class A and Class B Common Stock (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | Following is a reconciliation of net income and weighted average shares used for our basic earnings per share (“EPS”) and diluted EPS (in thousands, except per share amounts):
Three Months Ended March 31, |  | 2018 |  | 2017
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 49,983 |  |  | $ | 2,078 |  |  | $ | 47,826 |  |  | $ | 2,901 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  | 1 |  |  | (1 | ) |  | 1 |  |  | (1 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 269 |  |  | — |  |  | 359 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 1,801 |  |  | — |  |  | 2,534 |  |  | — |
Effect of dilutive stock options on net income |  | 7 |  |  | (7 | ) |  | 7 |  |  | (7 | )
Net income applicable to common stockholders - diluted |  | $ | 52,061 |  |  | $ | 2,070 |  |  | $ | 50,727 |  |  | $ | 2,893 |
Weighted average common shares outstanding – basic |  | 24,050 |  |  | 1,000 |  |  | 23,740 |  |  | 1,440 |
Conversion of Class B common shares into Class A common shares |  | 1,000 |  |  | — |  |  | 1,440 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 108 |  |  | — |  |  | 70 |  |  | — |
Weighted average common shares outstanding – diluted |  | 25,158 |  |  | 1,000 |  |  | 25,250 |  |  | 1,440 |
Net income per common share - basic |  | $ | 2.08 |  |  | $ | 2.08 |  |  | $ | 2.01 |  |  | $ | 2.01 |
Net income per common share - diluted |  | $ | 2.07 |  |  | $ | 2.07 |  |  | $ | 2.01 |  |  | $ | 2.01 |
Three Months Ended March 31, |  | 2018 |  | 2017
Diluted EPS |  | Class A |  | Class B |  | Class A |  | Class B
Antidilutive Securities |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  | 26 |  |  | — |  |  | — |  |  | — |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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