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Net Income Per Share of Class A and Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Weighted average common shares outstanding - basic (in shares) | 25,065 | 25,409 | 26,290
Weighted average common shares outstanding - diluted (in shares) | 25,145 | 25,521 | 26,490
Net income per share - basic (in dollars per share) | $ 9.78 | $ 7.76 | $ 6.96
Net income per share - diluted (in dollars per share) | $ 9.75 | $ 7.72 | $ 6.91
Class A common stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income applicable to common stockholders - basic | $ 233,399 | $ 182,369 | $ 165,172
Reallocation of distributed net income as a result of conversion of dilutive stock options | 4 | 8 | 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 | 57 | 120
Net income applicable to common stockholders - diluted | $ 245,217 | $ 197,058 | $ 182,999
Weighted average common shares outstanding - basic (in shares) | 23,857 | 23,515 | 23,729
Conversion of Class B common shares into Class A common shares (in shares) | 1,208 | 1,894 | 2,561
Effect employee stock purchases and restricted stock units on weighted average common shares (in shares) | 80 | 112 | 200
Weighted average common shares outstanding - diluted (in shares) | 25,145 | 25,521 | 26,490
Net income per share - basic (in dollars per share) | $ 9.78 | $ 7.76 | $ 6.96
Net income per share - diluted (in dollars per share) | $ 9.75 | $ 7.72 | $ 6.91
Class A common stock | Employee Stock Option |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares issuable pursuant to employee stock purchases and restricted stock units not included since they were antidilutive (in shares) | 12 | 0 | 16
Class B common stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income applicable to common stockholders - basic | $ 11,818 | $ 14,689 | $ 17,827
Reallocation of distributed net income as a result of conversion of dilutive stock options | (4) | (8) | (15)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding | 0 | 0 | 0
Conversion of Class B common shares into Class A common shares | 0 | 0 | 0
Effect of dilutive stock options on net income | (34) | (57) | (120)
Net income applicable to common stockholders - diluted | $ 11,780 | $ 14,624 | $ 17,692
Weighted average common shares outstanding - basic (in shares) | 1,208 | 1,894 | 2,561
Conversion of Class B common shares into Class A common shares (in shares) | 0 | 0 | 0
Effect employee stock purchases and restricted stock units on weighted average common shares (in shares) | 0 | 0 | 0
Weighted average common shares outstanding - diluted (in shares) | 1,208 | 1,894 | 2,561
Net income per share - basic (in dollars per share) | $ 9.78 | $ 7.76 | $ 6.96
Net income per share - diluted (in dollars per share) | $ 9.75 | $ 7.72 | $ 6.91
Class B common stock | Employee Stock Option |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares issuable pursuant to employee stock purchases and restricted stock units not included since they were antidilutive (in shares) | 0 | 0 | 0

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