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Earnings Per Share:
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
A reconciliation of share amounts used to compute earnings per share in the accompanying Condensed Consolidated Statements of Income was as follows (in thousands):
Three Months Ended March 31,
20212020
Net income available for common stock$96,316 $93,174 
Weighted average shares - basic62,633 61,778 
Dilutive effect of:
Equity compensation58 78 
Weighted average shares - diluted62,691 61,856 
Earnings per share of common stock:
Earnings per share, Basic$1.54 $1.51 
Earnings per share, Diluted$1.54 $1.51 

The following securities were excluded from the diluted earnings per share computation because of their anti-dilutive nature (in thousands):
Three Months Ended March 31,
20212020
Equity compensation14 12 
Restricted stock19 26 
Anti-dilutive shares33 38