Unaudited Interim Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Equity	Cumulative effect of adoption of accounting changes Retained Earnings (Accumulated Deficit)		Cumulative effect of adoption of accounting changes Total Equity
Beginning Balance at Dec. 31, 2018		$ 2,500	$ 6,120,436	$ 943,005	$ (324,373)	$ 6,741,568	$ (371)	[1]	$ (371)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital			(245,000)			(245,000)
Comprehensive income:
Net income (loss)				(900,024)		(900,024)
Other comprehensive income (loss), net of tax					224,777	224,777
Total comprehensive income (loss)						(675,247)
Ending Balance at Mar. 31, 2019		2,500	5,875,436	42,610	(99,596)	5,820,950
Beginning Balance at Dec. 31, 2018		2,500	6,120,436	943,005	(324,373)	6,741,568	(371)	[1]	(371)	[1]
Comprehensive income:
Net income (loss)	$ (1,068,794)
Other comprehensive income (loss), net of tax	559,172
Ending Balance at Jun. 30, 2019		2,500	5,628,936	(126,160)	234,799	5,740,075
Beginning Balance at Mar. 31, 2019		2,500	5,875,436	42,610	(99,596)	5,820,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital			(246,500)			(246,500)
Comprehensive income:
Net income (loss)	(168,770)			(168,770)		(168,770)
Other comprehensive income (loss), net of tax	334,395				334,395	334,395
Total comprehensive income (loss)						165,625
Ending Balance at Jun. 30, 2019		2,500	5,628,936	(126,160)	234,799	5,740,075
Beginning Balance at Dec. 31, 2019		2,500	5,142,936	(46,693)	428,612	5,527,355	(1,392)	[2]	(1,392)	[2]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital			(207,000)			(207,000)
Comprehensive income:
Net income (loss)				(820,788)		(820,788)
Other comprehensive income (loss), net of tax					1,010,888	1,010,888
Total comprehensive income (loss)						190,100
Ending Balance at Mar. 31, 2020		2,500	4,935,936	(868,873)	1,439,500	5,509,063
Beginning Balance at Dec. 31, 2019		2,500	5,142,936	(46,693)	428,612	5,527,355	$ (1,392)	[2]	$ (1,392)	[2]
Comprehensive income:
Net income (loss)	(2,577,002)
Other comprehensive income (loss), net of tax	1,206,320
Ending Balance at Jun. 30, 2020		2,500	4,762,936	(2,625,087)	1,634,932	3,775,281
Beginning Balance at Mar. 31, 2020		2,500	4,935,936	(868,873)	1,439,500	5,509,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital			(173,000)			(173,000)
Comprehensive income:
Net income (loss)	(1,756,214)			(1,756,214)		(1,756,214)
Other comprehensive income (loss), net of tax	$ 195,432				195,432	195,432
Total comprehensive income (loss)						(1,560,782)
Ending Balance at Jun. 30, 2020		$ 2,500	$ 4,762,936	$ (2,625,087)	$ 1,634,932	$ 3,775,281

[1] Includes the impact from the adoption of ASU 2017-08 and 2017-12. See Note 2 to the Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 for additional information.

[2] Includes the impact from the adoption of ASU 2016-13. See Note 2.