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Net Income Per Share of Class A and Class B Common Stock (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | 2018 |  | 2017
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 89,254 |  |  | $ | 3,853 |  |  | $ | 49,687 |  |  | $ | 2,199 |
Reallocation of net income as a result of conversion of dilutive stock options |  | 1 |  |  | (1 | ) |  | 1 |  |  | (1 | )
Reallocation of net income due to conversion of Class B to Class A common shares outstanding |  | 288 |  |  | — |  |  | 285 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 3,551 |  |  | — |  |  | 1,908 |  |  | — |
Effect of dilutive stock options on net income |  | 13 |  |  | (13 | ) |  | 5 |  |  | (5 | )
Net income applicable to common stockholders - diluted |  | $ | 93,107 |  |  | $ | 3,839 |  |  | $ | 51,886 |  |  | $ | 2,193 |
Weighted average common shares outstanding – basic |  | 23,164 |  |  | 1,000 |  |  | 23,948 |  |  | 1,060 |
Conversion of Class B common shares into Class A common shares |  | 1,000 |  |  | — |  |  | 1,060 |  |  | — |
Effect of dilutive stock options on weighted average common shares |  | 94 |  |  | — |  |  | 68 |  |  | — |
Weighted average common shares outstanding – diluted |  | 24,258 |  |  | 1,000 |  |  | 25,076 |  |  | 1,060 |
Net income per common share - basic |  | $ | 3.85 |  |  | $ | 3.85 |  |  | $ | 2.07 |  |  | $ | 2.07 |
Net income per common share - diluted |  | $ | 3.84 |  |  | $ | 3.84 |  |  | $ | 2.07 |  |  | $ | 2.07 |
Three Months Ended September 30, |  | 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 |  | 33 |  |  | — |  |  | 9 |  |  | — |
Nine Months Ended September 30, |  | 2018 |  | 2017
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 197,485 |  |  | $ | 8,343 |  |  | $ | 147,876 |  |  | $ | 7,937 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  | 4 |  |  | (4 | ) |  | 3 |  |  | (3 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 844 |  |  | — |  |  | 1,006 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 7,466 |  |  | — |  |  | 6,909 |  |  | — |
Effect of dilutive stock options on net income |  | 29 |  |  | (29 | ) |  | 19 |  |  | (19 | )
Net income applicable to common stockholders - diluted |  | $ | 205,828 |  |  | $ | 8,310 |  |  | $ | 155,813 |  |  | $ | 7,915 |
Weighted average common shares outstanding – basic |  | 23,670 |  |  | 1,000 |  |  | 23,812 |  |  | 1,278 |
Conversion of Class B common shares into Class A common shares |  | 1,000 |  |  | — |  |  | 1,278 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 97 |  |  | — |  |  | 68 |  |  | — |
Weighted average common shares outstanding – diluted |  | 24,767 |  |  | 1,000 |  |  | 25,158 |  |  | 1,278 |
Net income per common share - basic |  | $ | 8.34 |  |  | $ | 8.34 |  |  | $ | 6.21 |  |  | $ | 6.21 |
Net income per common share - diluted |  | $ | 8.31 |  |  | $ | 8.31 |  |  | $ | 6.19 |  |  | $ | 6.19 |
Nine Months Ended September 30, |  | 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 |  | 30 |  |  | — |  |  | 10 |  |  | — |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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