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Consolidated Statements of Common Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2018 39,664,884        
Balance at Dec. 31, 2018 $ 198,324 $ 344,250 $ 190,433 $ (4,144) $ 728,863
Common Stock Issuances, Net of Expenses (in shares) 145,617        
Common Stock Issuances, Net of Expenses $ 728       (19)
Net Income     66,495   66,495
Other Comprehensive Income       432 432
Employee Stock Incentive Plan Expense   5,245     5,245
Common Dividends     (41,781)   (41,781)
Common Stock Issuances, Net of Expenses   (747)      
Common Stock Retirements (in shares) (55,224)        
Common Stock Retirements $ (276) (2,454)     (2,730)
ASU 2018-02 2017 TCJA Stranded Tax Transfer     784 (784)  
Balance (in shares) at Sep. 30, 2019 39,755,277        
Balance at Sep. 30, 2019 $ 198,776 346,294 215,931 (4,496) 756,505
Balance (in shares) at Jun. 30, 2019 39,754,902        
Balance at Jun. 30, 2019 $ 198,775 345,030 205,115 (4,615) 744,305
Common Stock Issuances, Net of Expenses (in shares) 375        
Common Stock Issuances, Net of Expenses $ 1       (36)
Net Income     24,745   24,745
Other Comprehensive Income       119 119
Employee Stock Incentive Plan Expense   1,301     1,301
Common Dividends     (13,929)   (13,929)
Common Stock Issuances, Net of Expenses   (37)      
Balance (in shares) at Sep. 30, 2019 39,755,277        
Balance at Sep. 30, 2019 $ 198,776 346,294 215,931 (4,496) 756,505
Balance (in shares) at Dec. 31, 2019 40,157,591        
Balance at Dec. 31, 2019 $ 200,788 364,790 222,341 (6,437) 781,482
Common Stock Issuances, Net of Expenses (in shares) 932,791        
Common Stock Issuances, Net of Expenses $ 4,664 30,107     34,771
Net Income     77,183   77,183
Other Comprehensive Income       477 477
Employee Stock Incentive Plan Expense   5,282     5,282
Common Dividends     (45,056)   (45,056)
Common Stock Retirements (in shares) (38,217)        
Common Stock Retirements $ (191) (1,878)     (2,069)
Balance (in shares) at Sep. 30, 2020 41,052,165        
Balance at Sep. 30, 2020 $ 205,261 398,301 254,468 (5,960) 852,070
Balance (in shares) at Jun. 30, 2020 40,848,828        
Balance at Jun. 30, 2020 $ 204,244 390,141 233,705 (6,035) 822,055
Common Stock Issuances, Net of Expenses (in shares) 203,337        
Common Stock Issuances, Net of Expenses $ 1,017 6,885     7,902
Net Income     35,934   35,934
Other Comprehensive Income       75 75
Employee Stock Incentive Plan Expense   1,275     1,275
Common Dividends     (15,171)   (15,171)
Balance (in shares) at Sep. 30, 2020 41,052,165        
Balance at Sep. 30, 2020 $ 205,261 $ 398,301 $ 254,468 $ (5,960) $ 852,070