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CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDER'S EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Subsidiaries [Member]
Subsidiaries [Member]
Common Stock
Subsidiaries [Member]
Additional Paid-in Capital
Subsidiaries [Member]
Retained Earnings
Subsidiaries [Member]
Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2018 $ 3,860,758   $ 3,308,957 $ 629,003 $ (77,202) $ 3,707,924 $ 859 $ 3,275,105 $ 622,844 $ (190,884)
Balance (in shares) at Dec. 31, 2018   200         85,903,791      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) 210,708     210,708   292,924     292,924  
Dividends, Common Stock (64,220)     (64,220)   (164,575)     (164,575)  
Other comprehensive income (loss) (6,947)       (6,947) 2,407       2,407
Proceeds from Contributions from Parent 0         210,000   210,000    
Balance at Dec. 31, 2019 4,000,299   3,308,957 775,491 (84,149) 4,048,680 $ 859 3,485,105 751,193 (188,477)
Balance (in shares) at Dec. 31, 2019   200         85,903,791      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) 182,717     182,717   274,280     274,280  
Dividends, Common Stock (45,421)     (45,421)   (149,072)     (149,072)  
Other comprehensive income (loss) (2,288)       (2,288) 7,521       7,521
Proceeds from Contributions from Parent 4,575   4,575     0        
Balance at Dec. 31, 2020 $ 4,139,882   3,313,532 912,787 (86,437) $ 4,181,409 $ 859 3,485,105 876,401 (180,956)
Balance (in shares) at Dec. 31, 2020 200 200       85,903,791 85,903,791      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) $ 260,849     260,849   $ 336,063     336,063  
Dividends, Common Stock (106,420)     (106,420)   (229,857)     (229,857)  
Other comprehensive income (loss) 59,005       59,005 67,815       67,815
Proceeds from Contributions from Parent 210,000   210,000     0        
Balance at Dec. 31, 2021 $ 4,563,316   $ 3,523,532 $ 1,067,216 $ (27,432) $ 4,355,430 $ 859 $ 3,485,105 $ 982,607 $ (113,141)
Balance (in shares) at Dec. 31, 2021 200 200       85,903,791 85,903,791