Reinsurance (Income Statement Reinsurance Results) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022
Premiums:
Direct	$ 1,846,109	$ 1,853,184		$ 1,868,709
Assumed	92	(61)		776
Ceded	(1,453,074)	(1,524,226)		(1,604,277)
Net premiums	393,127	328,897		265,208
Policy charges and fee income:
Direct	3,190,753	2,995,595		3,034,193
Assumed	899,767	604,311		594,622
Ceded	3,292,277	(2,063,300)		(2,398,214)
Net policy charges and fee income	7,382,797	1,536,606		1,230,601
Net investment income:
Direct	2,474,541	1,700,684		920,674
Assumed	1,325	1,364		1,513
Ceded	(53,849)	(26,526)		(38,186)
Net investment income	2,422,017	1,675,522		884,001
Asset administration fees:
Direct	329,181	323,444		351,600
Assumed	0	0		0
Ceded	(105,618)	(90,494)		(67,418)
Net asset administration fees	223,563	232,950		284,182
Other income (loss):
Direct	297,868	636,930		(731,796)
Assumed	2,983	(475)		271
Ceded	458,905	114,908		95,252
Net other income	759,756	751,363	[1]	(636,273)	[1]
Realized investment gains (losses), net:
Direct	500,023	(1,203,453)		497,016
Assumed	85,248	162,291		(291,679)
Ceded	(133,854)	(105,937)		84,592
Realized investment gains (losses), net	451,417	(1,147,099)	[1]	289,929	[1]
Change in value of market risk benefits, net of related hedging gains (losses):
Direct	(98,562)	287,936		(181,260)
Assumed	2,626	(4,115)		0
Ceded	(338,019)	(390,594)		(519,321)
Net change in value of market risk benefits, net of related hedging gains (losses)	(433,955)	(106,773)	[2]	(700,581)
Policyholders’ benefits (including change in reserves):
Direct	3,825,305	3,354,306		3,362,353
Assumed	1,058,315	1,258,651		1,107,436
Ceded	3,468,713	(4,109,168)		(4,011,416)
Net policyholders’ benefits (including change in reserves)	8,352,333	503,789		458,373
Change in estimates of liability for future policy benefits:
Direct	303,141	(18,361)		1,716,983
Assumed	92,766	8,644		679,863
Ceded	(416,550)	13,669		(2,341,747)
Change in estimates of liability for future policy benefits	(20,643)	3,952		55,099
Interest credited to policyholders’ account balances:
Direct	1,310,867	884,527		805,411
Assumed	153,052	136,725		74,402
Ceded	(426,188)	(399,607)		(434,598)
Net interest credited to policyholders’ account balances	1,037,731	621,645	[1]	445,215
Reinsurance expense allowances and general and administrative expenses, net of capitalization and amortization	(1,398,843)	(403,517)		(152,779)
Unaffiliated activity
Premiums:
Assumed	89	(69)		149
Ceded	(107,449)	(70,169)		(42,721)
Policy charges and fee income:
Assumed	1,381	1,563		2,113
Ceded	(191,368)	(143,764)		(81,781)
Net investment income:
Ceded	(1,659)	23,023		10,802
Asset administration fees:
Ceded	(28,354)	(22,415)		0
Other income (loss):
Assumed	2,983	(475)		270
Ceded	142,267	44,260		18,440
Realized investment gains (losses), net:
Assumed	85,248	162,291		778,620
Ceded	(91,712)	(101,449)		83,612
Change in value of market risk benefits, net of related hedging gains (losses):
Assumed	2,626	(4,115)		0
Ceded	124,816	186,996		120,663
Policyholders’ benefits (including change in reserves):
Assumed	348	804		2,566
Ceded	(366,669)	(157,344)		(94,402)
Change in estimates of liability for future policy benefits:
Ceded	96,014	(1,367)		(6,824)
Interest credited to policyholders’ account balances:
Assumed	39,263	16,243		(95,285)
Ceded	$ (24,550)	$ 0		$ 0

[1] Amounts reflect revision to prior period Financial Statements. See Note 17 for additional information.

[2] Amounts reflect revision to prior period Financial Statements. See Note 17 for additional information.