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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares outstanding - basic (in shares) | 24,164 | 25,008 | 24,670 | 25,090
Weighted average common shares outstanding - diluted (in shares) | 24,258 | 25,076 | 24,767 | 25,158
Net income per common share - basic (in dollars per share) | $ 3.85 | $ 2.07 | $ 8.34 | $ 6.21
Net income per common share - diluted (in dollars per share) | $ 3.84 | $ 2.07 | $ 8.31 | $ 6.19
Class A common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 89,254 | $ 49,687 | $ 197,485 | $ 147,876
Reallocation of net income as a result of conversion of dilutive stock options | 1 | 1 | 4 | 3
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 288 | 285 | 844 | 1,006
Conversion of Class B common shares into Class A common shares | 3,551 | 1,908 | 7,466 | 6,909
Effect of dilutive stock options on net income | 13 | 5 | 29 | 19
Net income applicable to common stockholders - diluted | $ 93,107 | $ 51,886 | $ 205,828 | $ 155,813
Weighted average common shares outstanding - basic (in shares) | 23,164 | 23,948 | 23,670 | 23,812
Conversion of Class B common shares into Class A common shares (in shares) | 1,000 | 1,060 | 1,000 | 1,278
Effect of dilutive stock options on weighted average common shares (in shares) | 94 | 68 | 97 | 68
Weighted average common shares outstanding - diluted (in shares) | 24,258 | 25,076 | 24,767 | 25,158
Net income per common share - basic (in dollars per share) | $ 3.85 | $ 2.07 | $ 8.34 | $ 6.21
Net income per common share - diluted (in dollars per share) | $ 3.84 | $ 2.07 | $ 8.31 | $ 6.19
Class B common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 3,853 | $ 2,199 | $ 8,343 | $ 7,937
Reallocation of net income as a result of conversion of dilutive stock options | (1) | (1) | (4) | (3)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0 | 0 | 0 | 0
Conversion of Class B common shares into Class A common shares | 0 | 0 | 0 | 0
Effect of dilutive stock options on net income | (13) | (5) | (29) | (19)
Net income applicable to common stockholders - diluted | $ 3,839 | $ 2,193 | $ 8,310 | $ 7,915
Weighted average common shares outstanding - basic (in shares) | 1,000 | 1,060 | 1,000 | 1,278
Conversion of Class B common shares into Class A common shares (in shares) | 0 | 0 | 0 | 0
Effect of dilutive stock options on weighted average common shares (in shares) | 0 | 0 | 0 | 0
Weighted average common shares outstanding - diluted (in shares) | 1,000 | 1,060 | 1,000 | 1,278
Net income per common share - basic (in dollars per share) | $ 3.85 | $ 2.07 | $ 8.34 | $ 6.21
Net income per common share - diluted (in dollars per share) | $ 3.84 | $ 2.07 | $ 8.31 | $ 6.19
Employee Stock Option | Class A common stock |  |  |  |
Antidilutive Securities |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) | 33 | 9 | 30 | 10
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 | 0 | 0

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