Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||
2019 | 2018 | 2019 | 2018 | |||||||||||||
Basic: | ||||||||||||||||
Net income | $ | 93,822 | $ | 5,917 | $ | 125,988 | $ | 26,072 | ||||||||
Weighted average number of common shares during the period (in thousands) | 41,762 | 41,600 | 41,685 | 41,531 | ||||||||||||
Net income per share – basic | $ | 2.25 | $ | 0.14 | $ | 3.02 | $ | 0.63 | ||||||||
Diluted: | ||||||||||||||||
Net income | $ | 93,822 | $ | 5,917 | $ | 125,988 | $ | 26,072 | ||||||||
Weighted average number of common shares during the period | 41,762 | 41,600 | 41,685 | 41,531 | ||||||||||||
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities: | ||||||||||||||||
Stock options | 61 | 115 | 64 | 109 | ||||||||||||
Common stock units related to deferred compensation for employees | — | 25 | — | 25 | ||||||||||||
Restricted common stock units related to incentive compensation | 98 | (5 | ) | 102 | (6 | ) | ||||||||||
Total common and common equivalent shares adjusted to calculate diluted earnings per share | 41,921 | 41,735 | 41,851 | 41,659 | ||||||||||||
Net income per share – diluted | $ | 2.24 | $ | 0.14 | $ | 3.01 | $ | 0.63 | ||||||||