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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Income Per Share
The basic and diluted net income per share calculations for the years ended December 31, 2020, 2019, and 2018 were as follows:
Year Ended December 31,
202020192018
(In thousands, except per share data)
Net income$32,194 $61,338 $37,729 
Weighted-average shares outstanding - basic42,583 41,462 39,242 
Effect of dilutive securities from stock award plans1,160 1,481 1,317 
Effect of convertible senior notes and warrants— — — 
Weighted-average shares outstanding - diluted43,743 42,943 40,559 
Net income per share - basic$0.76 $1.48 $0.96 
Net income per share - diluted$0.74 $1.43 $0.93 
Anti-dilutive weighted-average shares related to stock award plans2,054 926 1,279 
Anti-dilutive weighted-average shares related to convertible senior notes and warrants11,816 — —