Deferred Policy Acquisition Costs - Reconciliation of DAC (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Policy Acquisition Cost [Line Items]
Total DAC, net	$ 3,256,845	$ 3,194,029
Term Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Total DAC, net	3,174,295	3,111,675	$ 2,872,816
Segregated Funds (Canada) [Member]
Deferred Policy Acquisition Cost [Line Items]
Total DAC, net	62,863	62,341	$ 65,411
Other [Member]
Deferred Policy Acquisition Cost [Line Items]
Total DAC, net	$ 19,687	$ 20,013