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Earnings Per Share and Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating basic net income per share
The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating basic net income per share:
Basic:For The Years Ended December 31,
(in thousands, except per share amounts)202120202019
Net income$94,347 $86,425 $84,342 
Less: (a) Distributed earnings to common shareholders51,689 47,206 42,702 
 Distributed earnings to participating securities134 158 180 
Undistributed earnings42,524 39,061 41,460 
(b) Undistributed earnings allocated to common shareholders42,414 38,930 41,285 
 Undistributed earnings allocated to participating securities110 131 175 
Total income available to common shareholders, basic (a)+(b)$94,103 $86,136 $83,987 
Weighted average Common Shares outstanding, basic36,921 36,880 36,814 
Basic earnings per Common Share$2.55 $2.34 $2.28 
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating diluted net income per share
The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating diluted net income per share:
Diluted:For The Years Ended December 31,
(in thousands, except per share amounts)202120202019
Common shareholders earnings, basic$94,103 $86,136 $83,987 
Undistributed earnings for dilutive stock options and restricted stock units110 131 175 
Total common shareholders earnings, diluted$94,213 $86,267 $84,162 
Weighted average Common Shares outstanding, basic36,921 36,880 36,814 
Stock-based compensation (1)
89 115 150 
Weighted average Common Shares outstanding, diluted37,010 36,995 36,964 
   
Diluted earnings per Common Share$2.55 $2.33 $2.28 
(1)         In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 100,020 restricted stock units, including performance awards, at December 31, 2021 were deemed to be outstanding in accordance with accounting guidance on earnings per share.