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Net Income Per Share of Class A and Class B Common Stock (Earnings Per Share Reconciliation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Weighted average common shares outstanding - basic (in shares) | 25,050 | 25,180
Weighted average common shares outstanding - diluted (in shares) | 25,158 | 25,250
Net income per common share - basic (in dollars per share) | $ 2.08 | $ 2.01
Net income per common share - diluted (in dollars per share) | $ 2.07 | $ 2.01
Class A common stock |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Net income applicable to common stockholders - basic | $ 49,983 | $ 47,826
Reallocation of net income as a result of conversion of dilutive stock options | 1 | 1
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 269 | 359
Conversion of Class B common shares into Class A common shares | 1,801 | 2,534
Effect of dilutive stock options on net income | 7 | 7
Net income applicable to common stockholders - diluted | $ 52,061 | $ 50,727
Weighted average common shares outstanding - basic (in shares) | 24,050 | 23,740
Conversion of Class B common shares into Class A common shares (in shares) | 1,000 | 1,440
Effect of dilutive stock options on weighted average common shares (in shares) | 108 | 70
Weighted average common shares outstanding - diluted (in shares) | 25,158 | 25,250
Net income per common share - basic (in dollars per share) | $ 2.08 | $ 2.01
Net income per common share - diluted (in dollars per share) | $ 2.07 | $ 2.01
Class B common stock |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Net income applicable to common stockholders - basic | $ 2,078 | $ 2,901
Reallocation of net income as a result of conversion of dilutive stock options | (1) | (1)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0 | 0
Conversion of Class B common shares into Class A common shares | 0 | 0
Effect of dilutive stock options on net income | (7) | (7)
Net income applicable to common stockholders - diluted | $ 2,070 | $ 2,893
Weighted average common shares outstanding - basic (in shares) | 1,000 | 1,440
Conversion of Class B common shares into Class A common shares (in shares) | 0 | 0
Effect of dilutive stock options on weighted average common shares (in shares) | 0 | 0
Weighted average common shares outstanding - diluted (in shares) | 1,000 | 1,440
Net income per common share - basic (in dollars per share) | $ 2.08 | $ 2.01
Net income per common share - diluted (in dollars per share) | $ 2.07 | $ 2.01
Employee Stock Option | Class A common stock |  |
Antidilutive Securities |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) | 26 | 0
Employee Stock Option | Class B common stock |  |
Antidilutive Securities |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) | 0 | 0

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