Policyholder Liabilities (Significant Inputs and Assumptions) (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Market Risk Benefit [Line Items]
Market risk benefits	$ 2,666,860	$ 2,225,621
Ceded market risk benefits	$ 659,217	$ 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	0.0185	0.0165
Minimum \| Risk-Free Interest Rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0298	0.0251
Minimum \| Nonperformance Risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0053	0.0006
Minimum \| Mortality \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0001	0.0001
Minimum \| Lapse \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0025	0.0025
Maximum \| Utilization \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.4737	0.7875
Maximum \| Option Budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0275	0.0250
Maximum \| Risk-Free Interest Rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0476	0.0490
Maximum \| Nonperformance Risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0266	0.0327
Maximum \| Mortality \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.4600	0.4400
Maximum \| Lapse \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.4000	0.4000
Weighted Average \| Utilization \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0655	0.0424
Weighted Average \| Option Budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0229	0.0231
Weighted Average \| Risk-Free Interest Rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0335	0.0331
Weighted Average \| Nonperformance Risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0198	0.0259
Weighted Average \| Mortality \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0397	0.0344
Weighted Average \| Lapse \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefit, measurement input	0.0370	0.0365

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
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 40
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480112/944-40-45-3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29G
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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