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Net income Per Share (Notes)
 3 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020, respectively:
 
Three Months Ended 
 
June 30,		Six Months Ended 
 
June 30,
(in thousands, except per share amounts)2021202020212020
Net income available to common stockholders$72,483 $53,479 $122,872 $90,305 
Basic weighted-average shares outstanding43,434 43,471 43,406 43,787 
Dilutive effect of potential common stock equivalents — restricted stock units207 192 214 193 
Diluted weighted-average shares outstanding43,641 43,663 43,620 43,980 
Net income per common share:    
Basic$1.67 $1.23 $2.83 $2.06 
Diluted$1.66 $1.22 $2.82 $2.05