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Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Basic earnings per common share are calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share adjust basic earnings per common share for the effects of potentially dilutive common shares. Potentially dilutive common shares include the dilutive effects of shares issuable under our equity compensation plans, including stock options and restricted stock, each using the treasury stock method.
| 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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