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Net Income Per Share
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per ShareBasic net income (loss) per share is computed by dividing net income (loss) for the period by the weighted-average number of shares outstanding during the period. In periods of net loss, all potential common shares are anti-dilutive, so diluted net loss per share equals the basic net loss per share. In periods of net income, diluted net income per share is computed by dividing net income for the period by the basic weighted-average number of shares plus any dilutive potential common stock outstanding during the period, using the treasury stock method. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards, and restricted stock units, as well as shares the Company could be obligated to issue from its convertible senior notes and warrants, as described in Note 10, Convertible Senior Notes. Any anti-dilutive weighted-average dilutive shares related to stock award plans, convertible senior notes, and warrants are excluded from the computation of the diluted net income per share.
The basic and diluted net income per share calculations for the three and nine months ended September 30, 2021 and 2020 were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(In thousands, except per share data)
Net income$29,317 $8,805 $63,868 $15,817 
Weighted-average shares outstanding – basic43,648 42,802 43,293 42,606 
Effect of dilutive securities from stock award plans2,087 889 2,086 1,045 
Effect of convertible senior notes2,156 — 1,816 — 
Effect of warrants450 — — — 
Weighted-average shares outstanding – diluted48,341 43,691 47,195 43,651 
Net income per share – basic$0.67 $0.21 $1.48 $0.37 
Net income per share – diluted$0.61 $0.20 $1.35 $0.36 
Anti-dilutive weighted-average shares related to stock award plans64 2,328 199 2,076 
Anti-dilutive weighted-average shares related to convertible senior notes and warrants— 11,816 5,908 11,816