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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares outstanding - basic (in shares) | 24,793 | 25,053 | 24,930 | 25,116
Weighted average common shares outstanding - diluted (in shares) | 24,882 | 25,106 | 25,028 | 25,177
Net income per common share - basic (in dollars per share) | $ 2.45 | $ 2.12 | $ 4.52 | $ 4.14
Net income per common share - diluted (in dollars per share) | $ 2.44 | $ 2.12 | $ 4.50 | $ 4.13
Class A common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 58,213 | $ 50,520 | $ 108,199 | $ 98,337
Reallocation of net income as a result of conversion of dilutive stock options | 1 | 1 | 2 | 2
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 289 | 340 | 557 | 700
Conversion of Class B common shares into Class A common shares | 2,149 | 2,334 | 3,947 | 4,876
Effect of dilutive stock options on net income | 8 | 5 | 16 | 12
Net income applicable to common stockholders - diluted | $ 60,660 | $ 53,200 | $ 112,721 | $ 103,927
Weighted average common shares outstanding - basic (in shares) | 23,793 | 23,791 | 23,930 | 23,765
Conversion of Class B common shares into Class A common shares (in shares) | 1,000 | 1,262 | 1,000 | 1,351
Effect of dilutive stock options on weighted average common shares (in shares) | 89 | 53 | 98 | 61
Weighted average common shares outstanding - diluted (in shares) | 24,882 | 25,106 | 25,028 | 25,177
Net income per common share - basic (in dollars per share) | $ 2.45 | $ 2.12 | $ 4.52 | $ 4.14
Net income per common share - diluted (in dollars per share) | $ 2.44 | $ 2.12 | $ 4.50 | $ 4.13
Class B common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 2,447 | $ 2,680 | $ 4,522 | $ 5,590
Reallocation of net income as a result of conversion of dilutive stock options | (1) | (1) | (2) | (2)
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 | (8) | (5) | (16) | (12)
Net income applicable to common stockholders - diluted | $ 2,438 | $ 2,674 | $ 4,504 | $ 5,576
Weighted average common shares outstanding - basic (in shares) | 1,000 | 1,262 | 1,000 | 1,351
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 | 1,262 | 1,000 | 1,351
Net income per common share - basic (in dollars per share) | $ 2.45 | $ 2.12 | $ 4.52 | $ 4.14
Net income per common share - diluted (in dollars per share) | $ 2.44 | $ 2.12 | $ 4.50 | $ 4.13
Employee Stock Option | Class A common stock |  |  |  |
Antidilutive Securities |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) | 30 | 22 | 56 | 11
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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