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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Basic and Diluted |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Numerator — basic and diluted |  |  |  |  |
Net income | $ | 107,962 |  |  | $ | 85,520 |  |  | $ | 66,053 |
Denominator |  |  |  |  |
Weighted average number of common shares outstanding — basic | 38,697 |  |  | 40,943 |  |  | 40,846 |
Effect of dilutive stock options | 117 |  |  | 281 |  |  | 388 |
Effect of dilutive restricted shares | 378 |  |  | 485 |  |  | 495 |
Weighted average number of common shares outstanding — diluted | 39,192 |  |  | 41,709 |  |  | 41,729 |
Earnings per common share — basic | $ | 2.79 |  |  | $ | 2.09 |  |  | $ | 1.62 |
Earnings per common share — diluted | $ | 2.75 |  |  | $ | 2.05 |  |  | $ | 1.58 |
Antidilutive stock options and restricted shares | 1,561 |  |  | 1,404 |  |  | 1,734 |

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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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