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Consolidated Statements of Shareholders' Equity (unaudited) - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Unrealized Gain on Available-for-Sale Debt, net of tax
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of tax
Beginning balance, shares (in shares) at Dec. 31, 2019   40,157,591          
Beginning balance at Dec. 31, 2019 $ 781,482 $ 200,788 $ 364,790 $ 222,341 $ (6,437) [1]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock Issuances, Net of Expenses (in shares)   932,791          
Common Stock Issuances, Net of Expenses 34,771 $ 4,664 30,107        
Common Stock Retirements and Forfeitures (in shares)   (38,217)          
Common Stock Retirements and Forfeitures (2,069) $ (191) (1,878)        
Net Income 77,183     77,183      
Other Comprehensive Income 477       477 [1]    
Stock Compensation Expense 5,282   5,282        
Common Dividends (45,056)     (45,056)      
Ending balance, shares (in shares) at Sep. 30, 2020   41,052,165          
Ending balance at Sep. 30, 2020 852,070 $ 205,261 398,301 254,468 (5,960) [1]    
Beginning balance, shares (in shares) at Jun. 30, 2020   40,848,828          
Beginning balance at Jun. 30, 2020 822,055 $ 204,244 390,141 233,705 (6,035) [1]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock Issuances, Net of Expenses (in shares)   203,337          
Common Stock Issuances, Net of Expenses 7,902 $ 1,017 6,885        
Net Income 35,934     35,934      
Other Comprehensive Income 75       75 [1]    
Stock Compensation Expense 1,275   1,275        
Common Dividends (15,171)     (15,171)      
Ending balance, shares (in shares) at Sep. 30, 2020   41,052,165          
Ending balance at Sep. 30, 2020 852,070 $ 205,261 398,301 254,468 (5,960) [1]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Before Tax         (11,528) $ 265 $ (11,793)
Tax Effect         3,021 (56) 3,077
Beginning balance, shares (in shares) at Dec. 31, 2020   41,469,879          
Beginning balance at Dec. 31, 2020 870,966 $ 207,349 414,246 257,878 (8,507) [1] 209 (8,716)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock Issuances, Net of Expenses (in shares)   105,806          
Common Stock Issuances, Net of Expenses (48) $ 530 (578)        
Common Stock Retirements and Forfeitures (in shares)   (35,701)          
Common Stock Retirements and Forfeitures (1,633) $ (179) (1,454)        
Net Income 125,152     125,152      
Other Comprehensive Income 336       336 [1]    
Stock Compensation Expense 6,354   6,354        
Common Dividends (48,645)     (48,645)      
Ending balance, shares (in shares) at Sep. 30, 2021   41,539,984          
Ending balance at Sep. 30, 2021 952,482 $ 207,700 418,568 334,385 (8,171) [1] 108 (8,279)
Beginning balance, shares (in shares) at Jun. 30, 2021   41,538,709          
Beginning balance at Jun. 30, 2021 915,123 $ 207,694 417,870 297,850 (8,291) [1]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock Issuances, Net of Expenses (in shares)   1,275          
Common Stock Issuances, Net of Expenses 0 $ 6 (6)        
Common Stock Retirements and Forfeitures (in shares)   0          
Common Stock Retirements and Forfeitures (126) $ 0 (126)        
Net Income 52,754     52,754      
Other Comprehensive Income 120       120 [1]    
Stock Compensation Expense 830   830        
Common Dividends (16,219)     (16,219)      
Ending balance, shares (in shares) at Sep. 30, 2021   41,539,984          
Ending balance at Sep. 30, 2021 $ 952,482 $ 207,700 $ 418,568 $ 334,385 (8,171) [1] 108 (8,279)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Before Tax         (11,065) 137 (11,202)
Tax Effect         $ 2,894 $ (29) $ 2,923
[1]
1Accumulated Other Comprehensive Income (Loss) as of September 30, 2021 and December 31, 2020 is comprised of the following:
(in thousands)September 30,
2021		December 31,
2020
Unrealized Gain on Available-for-Sale Debt Securities:  
Before Tax$137 $265 
Tax Effect(29)(56)
Unrealized Gain on Available-for-Sale Debt, net of tax108 209 
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits:
Before Tax(11,202)(11,793)
Tax Effect2,923 3,077 
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of tax(8,279)(8,716)
Accumulated Other Comprehensive Loss:
Before Tax(11,065)(11,528)
Tax Effect2,894 3,021 
Net Accumulated Other Comprehensive Loss$(8,171)$(8,507)