Unaudited Interim Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common   Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive   Income (Loss)
Beginning Balance at Dec. 31, 2020	$ 4,047,716	$ 2,500	$ 1,726,690	$ 1,772,398	$ 546,128
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital	105,900		105,900
Comprehensive income (loss):
NET INCOME (LOSS)	103,377			103,377
Other comprehensive income (loss), net of tax	(281,676)				(281,676)
Total comprehensive income (loss)	(178,299)
Ending Balance at Mar. 31, 2021	3,975,317	2,500	1,832,590	1,875,775	264,452
Beginning Balance at Dec. 31, 2021	5,955,094	2,500	6,042,491	(437,332)	347,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital	8,160		8,160
Comprehensive income (loss):
NET INCOME (LOSS)	(24,987)			(24,987)
Other comprehensive income (loss), net of tax	(804,210)				(804,210)
Total comprehensive income (loss)	(829,197)
Ending Balance at Mar. 31, 2022	$ 5,134,057	$ 2,500	$ 6,050,651	$ (462,319)	$ (456,775)