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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2017     53,579,986 39,064        
Beginning balance at Dec. 31, 2017 $ 1,820,206   $ 53,580 $ (2,306) $ 1,150,285 $ 548,617 $ (41,202) $ 111,232
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income available for common stock 272,662         258,442   14,220
Other comprehensive income (loss), net of tax 7,027           7,027  
Reclassification of certain tax effects from AOCI 740           740  
Reclassification to regulatory asset 6,519           6,519  
Dividends on common stock (106,591)         (106,591)    
Share-based compensation (in shares)     92,830 5,189        
Share-based compensation 7,190   $ 93 $ (204) 7,301      
Issuance of common stock (in shares)     6,371,690          
Issuance of common stock 299,000   $ 6,372   292,628      
Issuance costs (15)       (15)      
Dividend reinvestment and stock purchase plan (in shares)     4,061          
Dividend reinvestment and stock purchase plan 220   $ 4   216      
Other stock transactions 82       154 (72)    
Distributions to noncontrolling interest (19,617)             (19,617)
Ending balance (in shares) at Dec. 31, 2018     60,048,567 44,253        
Ending balance at Dec. 31, 2018 2,287,423   $ 60,049 $ (2,510) 1,450,569 700,396 (26,916) 105,835
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income available for common stock 213,322         199,310   14,012
Other comprehensive income (loss), net of tax (3,739)           (3,739)  
Dividends on common stock (124,647)         (124,647)    
Share-based compensation (in shares)     103,759 40,297        
Share-based compensation 7,076   $ 104 $ 2,243 4,729      
Issuance of common stock (in shares)     1,328,332          
Issuance of common stock 100,000   $ 1,328   98,672      
Issuance costs (1,182)       (1,182)      
Other stock transactions 327         327    
Distributions to noncontrolling interest (17,901)             (17,901)
Ending balance (in shares) at Dec. 31, 2019     61,480,658 3,956        
Ending balance at Dec. 31, 2019 2,464,069 $ 3,390 $ 61,481 $ (267) 1,552,788 778,776 (30,655) 101,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income available for common stock 242,763         227,608   15,155
Other comprehensive income (loss), net of tax 3,309           3,309  
Dividends on common stock (135,439)         (135,439)    
Share-based compensation (in shares)     123,578 28,536        
Share-based compensation 5,194   $ 123 $ (1,852) 6,923      
Issuance of common stock (in shares)     1,222,943          
Issuance of common stock 100,000   $ 1,223   98,777      
Issuance costs (1,203)       (1,203)      
Distributions to noncontrolling interest (15,839)             (15,839)
Ending balance (in shares) at Dec. 31, 2020     62,827,179 32,492        
Ending balance at Dec. 31, 2020 $ 2,662,647 $ (207) $ 62,827 $ (2,119) $ 1,657,285 $ 870,738 $ (27,346) $ 101,262