Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands	Total	Common  Stock	Additional  Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other   Comprehensive  Income (Loss)	Total Equity	Total Equity Cumulative Effect, Period of Adoption, Adjustment	[1]
Beginning Balance at Dec. 31, 2019		$ 2,500	$ 1,153,632	$ 1,577,453	$ (1,752)		$ 281,442	$ 3,015,027	$ (1,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			575,000					575,000
Contributed (distributed) capital-parent/child asset transfers			(1,942)					(1,942)
Comprehensive income (loss):
Net income (loss)	$ 196,697			196,697				196,697
Other Comprehensive Income (Loss), Net of Tax	264,686						264,686	264,686
Total comprehensive income (loss)								461,383
Ending Balance at Dec. 31, 2020		2,500	1,726,690	1,772,398			546,128	4,047,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			4,342,215					4,342,215
Contributed (distributed) capital-parent/child asset transfers			(26,414)					(26,414)
Comprehensive income (loss):
Net income (loss)	(2,209,730)			(2,209,730)				(2,209,730)
Other Comprehensive Income (Loss), Net of Tax	(198,693)						(198,693)	(198,693)
Total comprehensive income (loss)								(2,408,423)
Ending Balance at Dec. 31, 2021		2,500	6,042,491	(437,332)			347,435	5,955,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			17,861					17,861
Contributed (distributed) capital-parent/child asset transfers			(22,438)					(22,438)
Comprehensive income (loss):
Net income (loss)	341,749			341,749				341,749
Other Comprehensive Income (Loss), Net of Tax	$ (1,928,735)						(1,928,735)	(1,928,735)
Total comprehensive income (loss)								(1,586,986)
Ending Balance at Dec. 31, 2022		$ 2,500	$ 6,037,914	$ (95,583)			$ (1,581,300)	$ 4,363,531

[1] ncludes the impact from the adoption of Accounting Standards Update ("ASU") 2016-13. See Note 2.