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Condensed Financial Information of Registrant - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Statement of Income Captions [Line Items]      
Net income (loss) $ (81,297) $ (409,086) $ 40,809
Other comprehensive income (loss):      
Other post retirement benefits income (loss), net of tax 6,244 (4,324) (2,091)
Total other comprehensive income (loss), net of tax 6,244 (4,324) (2,091)
Comprehensive income (75,053) (413,410) 38,718
Parent Company      
Condensed Statement of Income Captions [Line Items]      
Net income (loss) (81,297) (409,086) 40,809
Other comprehensive income (loss):      
Other post retirement benefits income (loss), net of tax [1] 6,244 (4,324) (2,091)
Total other comprehensive income (loss), net of tax [1] 6,244 (4,324) (2,091)
Comprehensive income [1] $ (75,053) $ (413,410) $ 38,718
[1] Other comprehensive income (loss) relates to benefit plans at our subsidiaries.