Reinsurance (Reinsurance amounts included in the Statements of Financial Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Reinsurance recoverables	$ 8,128,490	$ 8,108,267
Deferred policy acquisition costs	(469,381)	(567,191)
Deferred sales inducements	(244,181)	(295,097)
Value of business acquired	(24,957)	(27,568)
Other assets	2,677,924	2,717,405
Policyholders’ account balances	11,663,141	11,749,651
Reinsurance payables	6,999,679	7,182,652
Other liabilities	947,539	942,223
Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables	8,128,490	8,108,267
Deferred policy acquisition costs	(520,154)	(530,095)
Deferred sales inducements	(21,288)	(26,080)
Value of business acquired	(1,794)	(2,047)
Other assets	51,988	53,622
Reinsurance payables	6,999,679	7,182,652
Other liabilities	$ 802,535	$ 824,387