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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Summary of Reconciliation of Weighted Average Share Amounts used to Compute Both Basic and Diluted Earnings Per Share
The following table reconciles the weighted average share amounts used to compute both basic and diluted earnings per share (in thousands):
 
Years Ended December 31,
 
202020192018
Weighted average shares outstanding:
Basic weighted average shares outstanding
116,397 116,175 116,057 
Add: Dilutive effect of stock options, RSUs, and contingently issuable shares
1,682 2,396 1,575 
Diluted weighted average shares outstanding
118,079 118,571 117,632