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Net Income Per Share
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per ShareThe calculation of net income per share for the three and six months ended June 30, 2021 and 2020, is reflected in the following table (in thousands, except per share amounts):
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2021202020212020
Net income$149,213 $46,196 $259,811 $136,111 
Basic:
Weighted average shares
110,861 112,865 111,141 113,026 
Diluted:
Weighted average shares
110,861 112,865 111,141 113,026 
Dilutive effect of potential common shares1,028 256 1,050 463 
Diluted weighted average shares111,889 113,121 112,191 113,489 
Net income per share:
Basic$1.35 $.41 $2.34 $1.20 
Diluted$1.33 $.41 $2.32 $1.20