Market Risk Benefits - Market Risk Benefits In Asset and Liability Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Market risk benefit assets	$ 1,427,488	$ 1,393,237
Market risk benefit liabilities	5,621,681	5,521,601
Variable Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Market risk benefit assets	1,427,488		$ 1,579,370
Market risk benefit liabilities	5,621,681		7,720,671
Total liabilities	$ 4,194,193	$ 4,550,625	$ 6,141,301	$ 8,884,362	$ (12,032)