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Policyholder Liabilities (Schedule of Present Value of Expected Future Policy Benefits) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |
Beginning balance, liability for future policy benefits | $ 303,200 | $ 318,677 |
Beginning balance at original discount rate | 317,634 | 342,453 |
Effect of changes in cash flow assumptions |  | 0 | $ (4,607)
Effect of actual variances from expected experience |  | (102) | (1,887)
Adjusted beginning of year balance |  | 317,532 | $ 335,959
Issuances | 796 | 6,945 |
Interest accrual | 3,295 | 13,710 |
Derecognition (lapses and benefit payments) | (9,493) | (38,980) |
Ending balance at original discount rate | 312,130 | 317,634 |
Effect of changes in discount rate assumptions | (18,187) | (14,434) |
Ending balance, liability for future policy benefits | $ 293,943 | $ 303,200 |

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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected future benefit and expense component for liability for future policy benefit, discounted at original rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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