Year Ended December 31, | ||||||||||||||||||||
2020 | 2019 | 2018 | ||||||||||||||||||
Basic: | ||||||||||||||||||||
Net income | $ | 133,315 | $ | 184,443 | $ | 18,343 | ||||||||||||||
Weighted average number of common shares during the period | 41,881 | 41,738 | 41,570 | |||||||||||||||||
Net income per share - basic | $ | 3.18 | $ | 4.42 | $ | 0.44 | ||||||||||||||
Diluted: | ||||||||||||||||||||
Net income | $ | 133,315 | $ | 184,443 | $ | 18,343 | ||||||||||||||
Weighted average number of common shares during the period | 41,881 | 41,738 | 41,570 | |||||||||||||||||
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities: | ||||||||||||||||||||
Stock options | 44 | 79 | 100 | |||||||||||||||||
Common stock units related to deferred compensation for employees | — | — | 25 | |||||||||||||||||
Restricted common stock units related to incentive compensation | 116 | 132 | 199 | |||||||||||||||||
Total common and common equivalent shares adjusted to calculate diluted earnings per share | 42,041 | 41,949 | 41,894 | |||||||||||||||||
Net income per share – diluted | $ | 3.17 | $ | 4.40 | $ | 0.44 | ||||||||||||||
Percentage of dilution compared to basic net income per share | 0.3 | % | 0.5 | % | — | % |