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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) entity | Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 14,743,795 | $ 14,582,728
Discount rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value, sensitivity, discount rate adjustment (basis points) | (0.0100) |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ 413,600 |
Discount rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value, sensitivity, discount rate adjustment (basis points) | 0.0100 |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ (360,400) |
Fixed index annuities - embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Coinsurance ceded, fixed index annuities embedded derivatives | 1,156,200 | 1,182,600
Limited partnership funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unfunded commitments | 183,000 | 180,900
Fair Value, Measurements, Recurring | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 351,142 | 1,795,511
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | $ 150,001 | $ 0
Significant Unobservable Inputs (Level 3) | Limited partnerships and limited liability companies | Fair Value, Measurements, Recurring | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Variable interest entities, number of consolidated variable interest entities | entity | 2 |

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- Definition Value of input used to measure embedded derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition 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/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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