Unaudited Interim Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2020	$ 2,701,145	$ 2,500	$ 4,382,936	$ (3,217,350)	$ 1,533,059
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to Parent	(192,000)			(192,000)
Comprehensive income:
Net income (loss)	1,889,813			1,889,813
Other comprehensive income (loss), net of tax	(1,412,895)				(1,412,895)
Total comprehensive income (loss)	476,918
Ending Balance at Mar. 31, 2021	2,986,063	2,500	4,382,936	(1,519,537)	120,164
Beginning Balance at Dec. 31, 2021	1,681,727	2,500	592,208	917,263	169,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital	(305,772)		(305,772)
Comprehensive income:
Net income (loss)	355,926			355,926
Other comprehensive income (loss), net of tax	(442,838)				(442,838)
Total comprehensive income (loss)	(86,912)
Ending Balance at Mar. 31, 2022	$ 1,289,043	$ 2,500	$ 286,436	$ 1,273,189	$ (273,082)