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Net Income Per Share
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Net Income Per Share
3.    Net Income Per Share

The following table reconciles basic net income per share of the Company's common stock to diluted net income per share for the three and nine months ended September 30, 2021 and 2020, respectively:
 
Three Months Ended 
 
September 30,
Nine Months Ended 
 
September 30,
(in thousands, except per share amounts)2021202020212020
Net income available to common stockholders$73,778 $67,057 $196,650 $157,362 
Basic weighted-average shares outstanding43,276 43,474 43,287 43,683 
Dilutive effect of potential common stock equivalents — restricted stock units209 209 213 190 
Diluted weighted-average shares outstanding43,485 43,683 43,500 43,873 
Net income per common share:    
Basic$1.70 $1.54 $4.54 $3.60 
Diluted$1.70 $1.54 $4.52 $3.59