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Policyholder Liabilities (Account Balances by Guaranteed Minimum Interest Rates) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 60,980,242	$ 60,901,641
Fixed Index Annuities
Policyholder Account Balance [Line Items]
Policyholder account balance	55,461,721	55,453,972	$ 53,826,234
Allocated to index strategies	46,561,493	46,529,959
Fixed Index Annuities | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 2,845,813	$ 2,511,382
Fixed Index Annuities | 0.00% - 0.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.00%	0.00%
Fixed Index Annuities | 0.00% - 0.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.50%	0.50%
Fixed Index Annuities | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 5,126,394	$ 5,411,382
Fixed Index Annuities | 0.50% - 1.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.50%	0.50%
Fixed Index Annuities | 0.50% - 1.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.00%	1.00%
Fixed Index Annuities | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 47,639	$ 51,219
Fixed Index Annuities | 1.00% - 1.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.00%	1.00%
Fixed Index Annuities | 1.00% - 1.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.50%	1.50%
Fixed Index Annuities | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 50	$ 50
Fixed Index Annuities | 1.50% - 2.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.50%	1.50%
Fixed Index Annuities | 1.50% - 2.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.00%	2.00%
Fixed Index Annuities | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 181,194	$ 190,627
Fixed Index Annuities | 2.00% - 2.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.00%	2.00%
Fixed Index Annuities | 2.00% - 2.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.50%	2.50%
Fixed Index Annuities | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 699,138	$ 759,353
Fixed Index Annuities | 2.50% - 3.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.50%	2.50%
Fixed Index Annuities | 2.50% - 3.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3.00%	3.00%
Fixed Index Annuities | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 0	$ 0
Fixed Index Annuities | Greater than 3.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3.00%	3.00%
Fixed Index Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 3,018,328	$ 3,200,978
Fixed Index Annuities | At guaranteed minimum | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | At guaranteed minimum | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	2,161,233	2,276,625
Fixed Index Annuities | At guaranteed minimum | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	39,737	43,029
Fixed Index Annuities | At guaranteed minimum | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	50	50
Fixed Index Annuities | At guaranteed minimum | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	118,170	121,921
Fixed Index Annuities | At guaranteed minimum | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	699,138	759,353
Fixed Index Annuities | At guaranteed minimum | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 1 to 50
Policyholder Account Balance [Line Items]
Policyholder account balance	2,299,067	2,117,465
Fixed Index Annuities | 1 to 50 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,265,350	1,032,438
Fixed Index Annuities | 1 to 50 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	962,799	1,008,139
Fixed Index Annuities | 1 to 50 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	7,902	8,190
Fixed Index Annuities | 1 to 50 | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 1 to 50 | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	63,016	68,698
Fixed Index Annuities | 1 to 50 | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 1 to 50 | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 51 to 150
Policyholder Account Balance [Line Items]
Policyholder account balance	2,323,135	2,462,003
Fixed Index Annuities | 51 to 150 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	452,749	466,789
Fixed Index Annuities | 51 to 150 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,870,378	1,995,206
Fixed Index Annuities | 51 to 150 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 51 to 150 | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 51 to 150 | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	8	8
Fixed Index Annuities | 51 to 150 | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | 51 to 150 | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance	1,259,698	1,143,567
Fixed Index Annuities | Greater than 150 basis points above | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,127,714	1,012,155
Fixed Index Annuities | Greater than 150 basis points above | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	131,984	131,412
Fixed Index Annuities | Greater than 150 basis points above | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | Greater than 150 basis points above | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | Greater than 150 basis points above | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | Greater than 150 basis points above | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Index Annuities | Greater than 150 basis points above | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities
Policyholder Account Balance [Line Items]
Policyholder account balance	5,726,033	5,913,965	$ 6,589,577
Fixed Rate Annuities | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 358	$ 53
Fixed Rate Annuities | 0.00% - 0.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.00%	0.00%
Fixed Rate Annuities | 0.00% - 0.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.50%	0.50%
Fixed Rate Annuities | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 4,283,776	$ 4,455,346
Fixed Rate Annuities | 0.50% - 1.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	0.50%	0.50%
Fixed Rate Annuities | 0.50% - 1.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.00%	1.00%
Fixed Rate Annuities | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 463,496	$ 430,289
Fixed Rate Annuities | 1.00% - 1.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.00%	1.00%
Fixed Rate Annuities | 1.00% - 1.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.50%	1.50%
Fixed Rate Annuities | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 579,402	$ 606,625
Fixed Rate Annuities | 1.50% - 2.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	1.50%	1.50%
Fixed Rate Annuities | 1.50% - 2.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.00%	2.00%
Fixed Rate Annuities | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 17,431	$ 18,737
Fixed Rate Annuities | 2.00% - 2.50% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.00%	2.00%
Fixed Rate Annuities | 2.00% - 2.50% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.50%	2.50%
Fixed Rate Annuities | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 336,606	$ 356,673
Fixed Rate Annuities | 2.50% - 3.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2.50%	2.50%
Fixed Rate Annuities | 2.50% - 3.00% | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3.00%	3.00%
Fixed Rate Annuities | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 44,964	$ 46,242
Fixed Rate Annuities | Greater than 3.00% | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3.00%	3.00%
Fixed Rate Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 1,259,207	$ 1,248,716
Fixed Rate Annuities | At guaranteed minimum | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	358	53
Fixed Rate Annuities | At guaranteed minimum | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	50,765	51,581
Fixed Rate Annuities | At guaranteed minimum | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	463,258	430,052
Fixed Rate Annuities | At guaranteed minimum | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	352,534	352,184
Fixed Rate Annuities | At guaranteed minimum | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	17,408	18,714
Fixed Rate Annuities | At guaranteed minimum | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	329,920	349,890
Fixed Rate Annuities | At guaranteed minimum | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	44,964	46,242
Fixed Rate Annuities | 1 to 50
Policyholder Account Balance [Line Items]
Policyholder account balance	202,142	208,891
Fixed Rate Annuities | 1 to 50 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 1 to 50 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	167,501	172,470
Fixed Rate Annuities | 1 to 50 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	238	237
Fixed Rate Annuities | 1 to 50 | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	27,694	29,378
Fixed Rate Annuities | 1 to 50 | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	23	23
Fixed Rate Annuities | 1 to 50 | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	6,686	6,783
Fixed Rate Annuities | 1 to 50 | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 51 to 150
Policyholder Account Balance [Line Items]
Policyholder account balance	1,678,125	3,038,226
Fixed Rate Annuities | 51 to 150 | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 51 to 150 | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	1,479,169	2,813,380
Fixed Rate Annuities | 51 to 150 | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 51 to 150 | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	198,956	224,846
Fixed Rate Annuities | 51 to 150 | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 51 to 150 | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | 51 to 150 | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance	2,586,559	1,418,132
Fixed Rate Annuities | Greater than 150 basis points above | 0.00% - 0.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | Greater than 150 basis points above | 0.50% - 1.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	2,586,341	1,417,915
Fixed Rate Annuities | Greater than 150 basis points above | 1.00% - 1.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | Greater than 150 basis points above | 1.50% - 2.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	218	217
Fixed Rate Annuities | Greater than 150 basis points above | 2.00% - 2.50%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | Greater than 150 basis points above | 2.50% - 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	0	0
Fixed Rate Annuities | Greater than 150 basis points above | Greater than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 0	$ 0

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Policyholder Account Balance, Allocated To Index Strategies

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Guaranteed minimum crediting rate on policyholder account balance.

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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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