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Basic and Diluted Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data) for the periods indicated:
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income from: |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations, net of tax |  | $ | 105,931 |  |  | $ | 5,035 |  |  | $ | 26,550 |
Discontinued operations, net of tax |  |  | 0 |  |  |  | 0 |  |  |  | 56,782 |
Net income |  | $ | 105,931 |  |  | $ | 5,035 |  |  | $ | 83,332 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares of class A common stock |  |  | 9,320 |  |  |  | 9,246 |  |  |  | 9,073 |
Weighted average common shares of class B common stock |  |  | 2,035 |  |  |  | 2,055 |  |  |  | 2,227 |
Total weighted average common stock shares outstanding |  |  | 11,355 |  |  |  | 11,301 |  |  |  | 11,300 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  |  | 184 |  |  |  | 55 |  |  |  | 1 |
Adjusted weighted average shares |  |  | 11,539 |  |  |  | 11,356 |  |  |  | 11,301 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 9.33 |  |  | $ | 0.45 |  |  | $ | 2.35 |
From discontinued operations |  |  | 0 |  |  |  | 0 |  |  |  | 5.02 |
Basic earnings per share |  | $ | 9.33 |  |  | $ | 0.45 |  |  | $ | 7.37 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 9.18 |  |  | $ | 0.44 |  |  | $ | 2.35 |
From discontinued operations |  |  | 0 |  |  |  | 0 |  |  |  | 5.02 |
Diluted earnings per share |  | $ | 9.18 |  |  | $ | 0.44 |  |  | $ | 7.37 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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