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Earnings Per Share Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the computation of the basic and diluted earnings per share for the years ended December 31, 2015, 2016 and 2017 (in thousands, except per share data):
| Year Ended December 31,
| 2015 |  | 2016 |  | 2017
Numerator for basic and diluted earnings per share: |  |  |  |  |
Net income | $ | 20,853 |  |  | $ | 19,581 |  |  | $ | 37,193 |
Less: Earnings allocated to unvested restricted stock | (257 | ) |  | (89 | ) |  | (135 | )
Income attributable to common stockholders | $ | 20,596 |  |  | $ | 19,492 |  |  | $ | 37,058 |
Denominator: |  |  |  |  |
Denominator for basic earnings per common share - weighted average shares outstanding | 17,791 |  |  | 16,515 |  |  | 16,438 |
Effect of dilutive securities: |  |  |  |  |
Stock options | 246 |  |  | 454 |  |  | 336 |
Convertible subordinated notes | 276 |  |  | 491 |  |  | 941 |
Denominator for diluted earnings per common share - weighted average shares outstanding | 18,313 |  |  | 17,460 |  |  | 17,715 |
Basic earnings per common share | $ | 1.16 |  |  | $ | 1.18 |  |  | $ | 2.25 |
Diluted earnings per common share | $ | 1.12 |  |  | $ | 1.12 |  |  | $ | 2.09 |

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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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