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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 95,128 |  |  | $ | 67,847 |  |  | $ | 48,098 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 29,392,559 |  |  |  | 29,394,559 |  |  |  | 31,350,542 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
SARS |  |  | 99,321 |  |  |  | 125,119 |  |  |  | 197,299 |
Restricted stock |  |  | 83,580 |  |  |  | 92,991 |  |  |  | 134,668 |
Diluted weighted average shares outstanding |  |  | 29,575,460 |  |  |  | 29,612,669 |  |  |  | 31,682,509 |
Basic earnings per share |  | $ | 3.24 |  |  | $ | 2.31 |  |  | $ | 1.53 |
Diluted earnings per share |  | $ | 3.22 |  |  | $ | 2.29 |  |  | $ | 1.52 |
Antidilutive Securities Excluded from Computation of Earnings Per Share | The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Restricted stock |  |  | 83 |  |  |  | 12 |  |  |  | 501 |
Stock appreciation rights |  |  | 10,617 |  |  |  | 4,631 |  |  |  | 5,828 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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