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Policyholder Liabilities - Reconciliation of Market Risk Benefits in an Asset Position and in a Liability Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Market Risk Benefit [Line Items] |  |  |  |
MRB asset balance | $ 230,304 | $ 229,871 | [1] |
MRB liability balance | 2,653,185 | 2,455,492 | [1] |
Net Liability | 2,422,881 | 2,225,621 |  |
Fixed Index Annuities |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
MRB asset balance | 226,747 | 226,294 |  |
MRB liability balance | 2,608,472 | 2,414,052 |  |
Net Liability | 2,381,725 | 2,187,758 |  | $ 2,557,379
Fixed Rate Annuities |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
MRB asset balance | 3,557 | 3,577 |  |
MRB liability balance | 44,713 | 41,440 |  |
Net Liability | $ 41,156 | $ 37,863 |  | $ 78,411
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29G -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819547-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 7B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=SL117782768-158439 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124509262&loc=SL117780254-158436 + Details
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- Definition Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29G -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819547-158441 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 7B -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124506351&loc=SL117782768-158439 + Details
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