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Condensed Financial Information of Registrant - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Statement of Income Captions [Line Items]      
Net income (loss) $ (33,322) $ 728,642 $ 364,189
Other comprehensive income:      
Other post-retirement benefits income, net of tax 2,182 45 5,627
Total other comprehensive income, net of tax 2,182 45 5,627
Comprehensive income (loss) (31,140) 728,687 369,816
Parent Company      
Condensed Statement of Income Captions [Line Items]      
Net income (loss) (33,322) 728,642 364,189
Other comprehensive income:      
Other post-retirement benefits income, net of tax [1] 2,182 45 5,627
Total other comprehensive income, net of tax [1] 2,182 45 5,627
Comprehensive income (loss) [1] $ (31,140) $ 728,687 $ 369,816
[1] Other comprehensive income relates to benefit plans at our subsidiaries.