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Consolidated Statements of Common Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Unrealized Gain (Loss) on Marketable Equity Securities, 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, 2017   39,557,491          
Beginning balance at Dec. 31, 2017 $ 696,892 $ 197,787 $ 343,450 $ 161,286 $ (5,631) [1]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock Issuances, Net of Expenses (in shares)   178,601          
Common Stock Issuances, Net of Expenses (93) $ 893 (986)        
Common Stock Retirements and Forfeitures (in shares)   (71,208)          
Common Stock Retirements and Forfeitures (3,011) $ (356) (2,655)        
Net Income 82,345     82,345      
Total Other Comprehensive Income (Loss) 1,487       1,487 [1]    
Stock Compensation Expense 4,441   4,441        
Common Dividends (53,198)     (53,198)      
Ending balance, shares (in shares) at Dec. 31, 2018   39,664,884          
Ending balance at Dec. 31, 2018 728,863 $ 198,324 344,250 190,433 (4,144) [1] $ (85) $ (4,059)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Before Tax         (6,653) (95) (6,558)
Tax Effect         1,725 20 1,705
Stranded Tax Effect         784 (10) 794
Common Stock Issuances, Net of Expenses (in shares)   547,931          
Common Stock Issuances, Net of Expenses 19,776 $ 2,740 17,036        
Common Stock Retirements and Forfeitures (in shares)   (55,224)          
Common Stock Retirements and Forfeitures (2,730) $ (276) (2,454)        
Net Income 86,847     86,847      
Total Other Comprehensive Income (Loss) (1,509)       (1,509) [1]    
Stranded Tax Transfer 0     784 (784) [1]    
Stock Compensation Expense 5,958   5,958        
Common Dividends (55,723)     (55,723)      
Ending balance, shares (in shares) at Dec. 31, 2019   40,157,591          
Ending balance at Dec. 31, 2019 781,482 $ 200,788 364,790 222,341 (6,437) [1] 54 (6,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Before Tax         (8,704) 68 (8,772)
Tax Effect         2,267 (14) 2,281
Stranded Tax Effect         0 0 0
Common Stock Issuances, Net of Expenses (in shares)   1,350,505          
Common Stock Issuances, Net of Expenses 51,802 $ 6,752 45,050        
Common Stock Retirements and Forfeitures (in shares)   (38,217)          
Common Stock Retirements and Forfeitures (2,069) $ (191) (1,878)        
Net Income 95,851     95,851      
Total Other Comprehensive Income (Loss) (2,070)       (2,070) [1]    
Stock Compensation Expense 6,284   6,284        
Common Dividends (60,314)     (60,314)      
Ending balance, shares (in shares) at Dec. 31, 2020   41,469,879          
Ending 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]              
Before Tax         (11,528) 265 (11,793)
Tax Effect         3,021 (56) 3,077
Stranded Tax Effect         $ 0 $ 0 $ 0
[1]
1Accumulated Other Comprehensive Income (Loss) as of December 31 is comprised of the following:
(in thousands)202020192018
Unrealized Gain (Loss) on Marketable Equity Securities:   
Before Tax$265 $68 $(95)
Tax Effect(56)(14)20 
Stranded Tax Effect— — (10)
Unrealized Gain (Loss) on Marketable Equity Securities, net of tax209 54 (85)
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits:
Before Tax(11,793)(8,772)(6,558)
Tax Effect3,077 2,281 1,705 
Stranded Tax Effect— — 794 
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of tax(8,716)(6,491)(4,059)
Accumulated Other Comprehensive Loss:
Before Tax(11,528)(8,704)(6,653)
Tax Effect3,021 2,267 1,725 
Stranded Tax Effect— — 784 
Net Accumulated Other Comprehensive Loss$(8,507)$(6,437)$(4,144)