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Consolidated Statements of Common Shareholders' Equity - USD ($)
$ in Thousands
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
AOCI Attributable to Parent [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2016       39,348,136      
Balance at Dec. 31, 2016     $ (3,800) [1] $ 196,741 $ 337,684 $ 139,479 $ 670,104
At-the-Market Offering (in shares)       257,059      
Common Stock Issuances, Net of Expenses       $ 1,285 3,684   4,969
Common Stock Retirements and Forfeitures (in shares)       (47,704)      
Common Stock Retirements and Forfeitures       $ (239) (1,560)   (1,799)
Net Income           72,439 72,439
Balance     (1,831)       (1,831)
Employee Stock Incentive Plan Expense         3,642   3,642
Common Dividends           (50,632) (50,632)
Balance (in shares) at Dec. 31, 2017       39,557,491      
Balance at Dec. 31, 2017 $ 46 $ (5,677) (5,631) [1] $ 197,787 343,450 161,286 696,892
Before Tax 71 (9,462) (9,391)        
Tax Effect (15) 2,991 2,976        
Stranded Tax Effect (10) 794 784        
At-the-Market Offering (in shares)       178,601      
Common Stock Issuances, Net of Expenses       $ 893     (93)
Common Stock Issuances, Net of Expenses         (986)    
Common Stock Retirements and Forfeitures (in shares)       (71,208)      
Common Stock Retirements and Forfeitures       $ (356) (2,655)   (3,011)
Net Income           82,345 82,345
Balance     1,487       1,487
Employee Stock Incentive Plan Expense         4,441   4,441
Common Dividends           (53,198) (53,198)
Balance (in shares) at Dec. 31, 2018       39,664,884      
Balance at Dec. 31, 2018 (85) (4,059) (4,144) [1] $ 198,324 344,250 190,433 728,863
Before Tax (95) (6,558) (6,653)        
Tax Effect 20 1,705 1,725        
Stranded Tax Effect (10) 794 784        
At-the-Market Offering (in shares)       547,931      
Common Stock Issuances, Net of Expenses       $ 2,740 17,036   19,776
Common Stock Retirements and Forfeitures (in shares)       (55,224)      
Common Stock Retirements and Forfeitures       $ (276) (2,454)   (2,730)
Net Income           86,847 86,847
Balance     (1,509)       (1,509)
Employee Stock Incentive Plan Expense         5,958   5,958
Common Dividends           (55,723) (55,723)
ASU 2018-02 2017 TCJA Stranded Tax Transfer     (784)     784  
Balance (in shares) at Dec. 31, 2019       40,157,591      
Balance at Dec. 31, 2019 54 (6,491) (6,437) [1] $ 200,788 $ 364,790 $ 222,341 $ 781,482
Before Tax 68 (8,772) (8,704)        
Tax Effect (14) 2,281 2,267        
Stranded Tax Effect $ 0 $ 0 $ 0        
[1] Accumulated Other Comprehensive Loss on December 31 is comprised of the following: (in thousands) 2019 2018 2017 Unrealized Gain (Loss) on Marketable Equity Securities: Before Tax $ 68 $ (95 ) $ 71 Tax Effect (14 ) 20 (15 ) Stranded Tax Effect - (10 ) (10 ) Unrealized Gain (Loss) on Marketable Equity Securities net-of-tax 54 (85 ) 46 Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits: Before Tax (8,772 ) (6,558 ) (9,462 ) Tax Effect 2,281 1,705 2,991 Stranded Tax Effect - 794 794 Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits net-of-tax (6,491 ) (4,059 ) (5,677 ) Accumulated Other Comprehensive Loss: Before Tax (8,704 ) (6,653 ) (9,391 ) Tax Effect 2,267 1,725 2,976 Stranded Tax Effect - 784 784 Net Accumulated Other Comprehensive Loss $ (6,437 ) $ (4,144 ) $ (5,631 )