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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, 2017
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, |  | 2017 |  | 2016
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 49,687 |  |  | $ | 2,199 |  |  | $ | 50,262 |  |  | $ | 3,779 |
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 |  | 285 |  |  | — |  |  | 439 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 1,908 |  |  | — |  |  | 3,326 |  |  | — |
Effect of dilutive stock options on net income |  | 5 |  |  | (5 | ) |  | 13 |  |  | (13 | )
Net income applicable to common stockholders - diluted |  | $ | 51,886 |  |  | $ | 2,193 |  |  | $ | 54,041 |  |  | $ | 3,765 |
Weighted average common shares outstanding – basic |  | 23,948 |  |  | 1,060 |  |  | 23,432 |  |  | 1,762 |
Conversion of Class B common shares into Class A common shares |  | 1,060 |  |  | — |  |  | 1,762 |  |  | — |
Effect of dilutive stock options on weighted average common shares |  | 68 |  |  | — |  |  | 96 |  |  | — |
Weighted average common shares outstanding – diluted |  | 25,076 |  |  | 1,060 |  |  | 25,290 |  |  | 1,762 |
Net income per common share - basic |  | $ | 2.07 |  |  | $ | 2.07 |  |  | $ | 2.15 |  |  | $ | 2.15 |
Net income per common share - diluted |  | $ | 2.07 |  |  | $ | 2.07 |  |  | $ | 2.14 |  |  | $ | 2.14 |
Three Months Ended September 30, |  | 2017 |  | 2016
Diluted EPS |  | Class A |  | Class B |  | Class A |  | Class B
Antidilutive Securities |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  | 9 |  |  | — |  |  | — |  |  | — |
Nine Months Ended September 30, |  | 2017 |  | 2016
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 147,876 |  |  | $ | 7,937 |  |  | $ | 134,533 |  |  | $ | 11,206 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  | 3 |  |  | (3 | ) |  | 5 |  |  | (5 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 1,006 |  |  | — |  |  | 1,365 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 6,909 |  |  | — |  |  | 9,794 |  |  | — |
Effect of dilutive stock options on net income |  | 19 |  |  | (19 | ) |  | 42 |  |  | (42 | )
Net income applicable to common stockholders - diluted |  | $ | 155,813 |  |  | $ | 7,915 |  |  | $ | 145,739 |  |  | $ | 11,159 |
Weighted average common shares outstanding – basic |  | 23,812 |  |  | 1,278 |  |  | 23,530 |  |  | 1,960 |
Conversion of Class B common shares into Class A common shares |  | 1,278 |  |  | — |  |  | 1,960 |  |  | — |
Effect of dilutive stock options on weighted average common shares |  | 68 |  |  | — |  |  | 108 |  |  | — |
Weighted average common shares outstanding – diluted |  | 25,158 |  |  | 1,278 |  |  | 25,598 |  |  | 1,960 |
Net income per common share - basic |  | $ | 6.21 |  |  | $ | 6.21 |  |  | $ | 5.72 |  |  | $ | 5.72 |
Net income per common share - diluted |  | $ | 6.19 |  |  | $ | 6.19 |  |  | $ | 5.69 |  |  | $ | 5.69 |
Nine Months Ended September 30, |  | 2017 |  | 2016
Diluted EPS |  | Class A |  | Class B |  | Class A |  | Class B
Antidilutive Securities |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  | 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://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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