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WEIGHTED AVERAGE SHARES OUTSTANDING (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Summary of Weighted Average Number of Shares
Earnings per share have been computed based on the following weighted average number of common shares outstanding:

 Three Months Ended
September 30,
Nine Months Ended
September 30,
(share data in thousands)2021202020212020
Average common shares outstanding69,440 69,231 69,445 69,243 
Common share equivalents:    
Stock options49 65 22 
Nonvested restricted share grants142 85 143 122 
Performance stock units125 25 119 16 
Average common shares outstanding, assuming dilution69,756 69,346 69,772 69,403