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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Basic and Diluted Earnings per share | The following table sets forth the calculation of EPS for the years ended December 31, 2017, 2016, and 2015:
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (In thousands, except per share amounts)
Weighted average basic common shares outstanding |  | 20,420 |  |  | 21,161 |  |  | 23,148 |
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock |  | 5 |  |  | 9 |  |  | 4 |
Weighted average dilutive common shares outstanding |  | 20,425 |  |  | 21,170 |  |  | 23,152 |
Basic: |  |  |  |  |  |
Net income |  | $ | 213,442 |  |  | $ | 147,065 |  |  | $ | 93,999 |
Less: Earnings allocated to participating securities |  | 7,512 |  |  | 5,871 |  |  | 3,595 |
Earnings available to basic common shares |  | $ | 205,930 |  |  | $ | 141,194 |  |  | $ | 90,404 |
Basic earnings per common share |  | $ | 10.08 |  |  | $ | 6.67 |  |  | $ | 3.91 |
Diluted: |  |  |  |  |  |
Net income |  | $ | 213,442 |  |  | $ | 147,065 |  |  | $ | 93,999 |
Less: Earnings allocated to participating securities |  | 7,511 |  |  | 5,869 |  |  | 3,595 |
Earnings available to diluted common shares |  | $ | 205,931 |  |  | $ | 141,196 |  |  | $ | 90,404 |
Diluted earnings per common share |  | $ | 10.08 |  |  | $ | 6.67 |  |  | $ | 3.90 |

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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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