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Net Income per Share
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income per Share Net Income per ShareBasic net income per share is computed using the weighted average number of common shares outstanding during the applicable period. Diluted net income per share is computed using the weighted average number of common shares outstanding during the period, plus the dilutive effect of potential common stock. Potential common stock consists of shares issuable pursuant to stock options, RSUs, DSUs, convertible senior notes and warrants issued by the Company. The dilutive effect of outstanding awards and convertible securities is reflected in diluted earnings per share by application of the treasury stock method.
The following table sets forth the components used in the computation of basic and diluted net income per share for the years ended December 31, 2020, 2019 and 2018 (in thousands, except per share data):
 
202020192018
Numerator:
Net income$557,054 $478,035 $298,373 
Denominator:
Shares used for basic net income per share162,490 162,706 167,312 
Effect of dilutive securities:
Stock options31 68 132 
RSUs and DSUs1,819 1,799 1,744 
Convertible senior notes873 — — 
Warrants related to issuance of convertible senior notes— — — 
Shares used for diluted net income per share165,213 164,573 169,188 
Basic net income per share$3.43 $2.94 $1.78 
Diluted net income per share$3.37 $2.90 $1.76 

For the years ended December 31, 2020, 2019 and 2018, certain potential outstanding shares from stock options, service-based RSUs, convertible notes and warrants were excluded from the computation of diluted net income per share because the effect of including these items was anti-dilutive. Additionally, certain performance-based RSUs were excluded from the computation of diluted net income per share because the underlying performance conditions for such RSUs had not been met as of these dates. The number of potentially outstanding shares excluded from the computation of diluted net income per share for the years ended December 31, 2020, 2019 and 2018 (in thousands):

202020192018
Service-based RSUs591 763 899 
Market-and performance-based RSUs1,409 1,349 1,509 
Convertible senior notes12,922 21,991 19,797 
Warrants related to issuance of convertible senior notes21,991 21,991 19,797 
Total shares excluded from computation36,913 46,094 42,002