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Net Income Per Share of Class A and Class B Common Stock (Tables) | 12 Months Ended
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Dec. 31, 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):
Year Ended December 31, |  | 2017 |  | 2016 |  | 2015
(in thousands, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 233,399 |  |  | $ | 11,818 |  |  | $ | 182,369 |  |  | $ | 14,689 |  |  | $ | 165,172 |  |  | $ | 17,827 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  | 4 |  |  | (4 | ) |  | 8 |  |  | (8 | ) |  | 15 |  |  | (15 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 1,275 |  |  | — |  |  | 1,791 |  |  | — |  |  | 1,932 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 10,505 |  |  | — |  |  | 12,833 |  |  | — |  |  | 15,760 |  |  | — |
Effect of dilutive stock options on net income |  | 34 |  |  | (34 | ) |  | 57 |  |  | (57 | ) |  | 120 |  |  | (120 | )
Net income applicable to common stockholders - diluted |  | $ | 245,217 |  |  | $ | 11,780 |  |  | $ | 197,058 |  |  | $ | 14,624 |  |  | $ | 182,999 |  |  | $ | 17,692 |
Weighted average common shares outstanding – basic |  | 23,857 |  |  | 1,208 |  |  | 23,515 |  |  | 1,894 |  |  | 23,729 |  |  | 2,561 |
Conversion of Class B common shares into Class A common shares |  | 1,208 |  |  | — |  |  | 1,894 |  |  | — |  |  | 2,561 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 80 |  |  | — |  |  | 112 |  |  | — |  |  | 200 |  |  | — |
Weighted average common shares outstanding – diluted |  | 25,145 |  |  | 1,208 |  |  | 25,521 |  |  | 1,894 |  |  | 26,490 |  |  | 2,561 |
Net income per common share - basic |  | $ | 9.78 |  |  | $ | 9.78 |  |  | $ | 7.76 |  |  | $ | 7.76 |  |  | $ | 6.96 |  |  | $ | 6.96 |
Net income per common share - diluted |  | $ | 9.75 |  |  | $ | 9.75 |  |  | $ | 7.72 |  |  | $ | 7.72 |  |  | $ | 6.91 |  |  | $ | 6.91 |
Antidilutive Securities |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable pursuant to employee stock purchases not included since they were antidulutive |  | 12 |  |  | — |  |  | — |  |  | — |  |  | 16 |  |  | — |

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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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