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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 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 
 June 30,		 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)2021202020212020
Net income$26,576 $25,612 $45,844 $39,684 
Less: (a) Distributed earnings to common shareholders12,366 11,250 24,727 22,492 
Distributed earnings to participating securities35 40 65 77 
Undistributed earnings14,175 14,322 21,052 17,115 
          (b) Undistributed earnings allocated to common shareholders14,135 14,271 20,997 17,057 
Undistributed earnings allocated to participating securities40 51 55 58 
Total income available to common shareholders, basic (a)+(b)$26,501 $25,521 $45,724 $39,549 
Weighted average Common Shares outstanding, basic36,916 36,884 36,907 36,872 
Basic earnings per Common Share$0.72 $0.69 $1.24 $1.07 
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 
 June 30,		 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)2021202020212020
Common shareholders earnings, basic$26,501 $25,521 $45,724 $39,549 
Undistributed earnings for dilutive stock-based awards40 51 55 58 
Total common shareholders earnings, diluted$26,541 $25,572 $45,779 $39,607 
Weighted average common shares outstanding, basic36,916 36,884 36,907 36,872 
Stock-based compensation (1)91 116 86 113 
Weighted average common shares outstanding, diluted37,007 37,000 36,993 36,985 
Diluted earnings per Common Share$0.72 $0.69 $1.24 $1.07 
(1)     All of the 107,772 and 133,863 restricted stock units at June 30, 2021 and 2020, respectively, were included in the calculation of diluted EPS for the three and six months ended June 30, 2021 and 2020.