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Net Income Per Share of Class A and Class B Common Stock (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | 2018 |  | 2017
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 58,213 |  |  | $ | 2,447 |  |  | $ | 50,520 |  |  | $ | 2,680 |
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 |  | 289 |  |  | — |  |  | 340 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 2,149 |  |  | — |  |  | 2,334 |  |  | — |
Effect of dilutive stock options on net income |  | 8 |  |  | (8 | ) |  | 5 |  |  | (5 | )
Net income applicable to common stockholders - diluted |  | $ | 60,660 |  |  | $ | 2,438 |  |  | $ | 53,200 |  |  | $ | 2,674 |
Weighted average common shares outstanding – basic |  | 23,793 |  |  | 1,000 |  |  | 23,791 |  |  | 1,262 |
Conversion of Class B common shares into Class A common shares |  | 1,000 |  |  | — |  |  | 1,262 |  |  | — |
Effect of dilutive stock options on weighted average common shares |  | 89 |  |  | — |  |  | 53 |  |  | — |
Weighted average common shares outstanding – diluted |  | 24,882 |  |  | 1,000 |  |  | 25,106 |  |  | 1,262 |
Net income per common share - basic |  | $ | 2.45 |  |  | $ | 2.45 |  |  | $ | 2.12 |  |  | $ | 2.12 |
Net income per common share - diluted |  | $ | 2.44 |  |  | $ | 2.44 |  |  | $ | 2.12 |  |  | $ | 2.12 |
Three Months Ended June 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 |  |  | — |  |  | 22 |  |  | — |
Six Months Ended June 30, |  | 2018 |  | 2017
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 108,199 |  |  | $ | 4,522 |  |  | $ | 98,337 |  |  | $ | 5,590 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  | 2 |  |  | (2 | ) |  | 2 |  |  | (2 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 557 |  |  | — |  |  | 700 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 3,947 |  |  | — |  |  | 4,876 |  |  | — |
Effect of dilutive stock options on net income |  | 16 |  |  | (16 | ) |  | 12 |  |  | (12 | )
Net income applicable to common stockholders - diluted |  | $ | 112,721 |  |  | $ | 4,504 |  |  | $ | 103,927 |  |  | $ | 5,576 |
Weighted average common shares outstanding – basic |  | 23,930 |  |  | 1,000 |  |  | 23,765 |  |  | 1,351 |
Conversion of Class B common shares into Class A common shares |  | 1,000 |  |  | — |  |  | 1,351 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 98 |  |  | — |  |  | 61 |  |  | — |
Weighted average common shares outstanding – diluted |  | 25,028 |  |  | 1,000 |  |  | 25,177 |  |  | 1,351 |
Net income per common share - basic |  | $ | 4.52 |  |  | $ | 4.52 |  |  | $ | 4.14 |  |  | $ | 4.14 |
Net income per common share - diluted |  | $ | 4.50 |  |  | $ | 4.50 |  |  | $ | 4.13 |  |  | $ | 4.13 |
Six Months Ended June 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 |  | 56 |  |  | — |  |  | 11 |  |  | — |

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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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