Policyholder Liabilities - Significant Inputs and Assumptions (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Market Risk Benefit [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk	$ 2,422,881	$ 2,225,621
Ceded market risk benefits	$ 685,702	$ 604,615
Minimum \| Utilization \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0004	0.0004
Minimum \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0165	0.0165
Minimum \| Risk-free interest rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0235	0.0251
Minimum \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0055	0.0006
Maximum \| Utilization \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.7875	0.7875
Maximum \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0250	0.0250
Maximum \| Risk-free interest rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0472	0.0490
Maximum \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0349	0.0327
Average \| Utilization \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0418	0.0424
Average \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0231	0.0231
Average \| Risk-free interest rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0301	0.0331
Average \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0271	0.0259

Market Risk Benefit, Reinsurance Recoverable, after Increase (Decrease) from Instrument-Specific Credit Risk

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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
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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

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+ References

No definition available.

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- Definition

Value of measurement input used to measure 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 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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