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Earnings per Share/Capital Stock: (Tables)
 9 Months Ended
Sep. 30, 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
Basic: For The Three Months Ended 
 September 30,		 For The Nine Months Ended 
 September 30,
(in thousands, except per share amounts)2021202020212020
Net income$28,153 $26,530 $73,997 $66,214 
Less: (a) Distributed earnings to common shareholders13,480 12,356 38,207 34,848 
Distributed earnings to participating securities37 43 100 116 
Undistributed earnings14,636 14,131 35,690 31,250 
          (b) Undistributed earnings allocated to common shareholders14,596 14,083 35,597 31,146 
Undistributed earnings allocated to participating securities40 48 93 104 
Total income available to common shareholders, basic (a)+(b)$28,076 $26,439 $73,804 $65,994 
Weighted average Common Shares outstanding, basic36,933 36,886 36,916 36,877 
Basic earnings per Common Share$0.76 $0.72 $2.00 $1.79 
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 Three Months Ended 
 September 30,
 For The Nine Months Ended 
 September 30,
(in thousands, except per share amounts)2021202020212020
Common shareholders earnings, basic$28,076 $26,439 $73,804 $65,994 
Undistributed earnings for dilutive stock-based awards40 48 93 104 
Total common shareholders earnings, diluted$28,116 $26,487 $73,897 $66,098 
Weighted average common shares outstanding, basic36,933 36,886 36,916 36,877 
Stock-based compensation (1)
92 116 88 113 
Weighted average common shares outstanding, diluted37,025 37,002 37,004 36,990 
Diluted earnings per Common Share$0.76 $0.72 $2.00 $1.79 
(1)     All of the 101,267 and 127,234 restricted stock units at September 30, 2021 and 2020, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2021 and 2020.