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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 13,208,399 | $ 8,850,608
Fair Value, Measurements, Recurring | Corporate Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 0 | 0
Purchases | 2,233 | 0
Transfers in | 391,702 | 0
Transfers out | 0 | 0
Included in net income | 0 | 0
Included in other comprehensive income (loss) | 8,413 | 0
Ending balance | 402,348 | 0
Fair Value, Measurements, Recurring | Other Asset Backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 0 | 0
Purchases | 296,800 | 0
Transfers in | 153,669 | 0
Transfers out | 0 | 0
Included in net income | 0 | 0
Included in other comprehensive income (loss) | (7,551) | 0
Ending balance | 442,918 | 0
Fair Value, Measurements, Recurring | Other Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 6,349 | 0
Transfers in | 0 | 6,349
Transfers out | (3,867) | 0
Included in net income | (2,482) | 0
Included in other comprehensive income (loss) | 0 | 0
Ending balance | 0 | 6,349
Fair Value, Measurements, Recurring | Limited Partnerships and Limited Liability Companies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 0 | 0
Purchases and sales, net | 57,574 | 0
Included in net income | 6,635 | 0
Ending balance | 64,209 | 0
Fair Value, Measurements, Recurring | Real Estate Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 337,939 | 0
Purchases and sales, net | 602,298 | 335,767
Included in net income | 322 | 2,172
Ending balance | 940,559 | 337,939
Funds Withheld Liability - Embedded Derivative | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 0 | 0
Transfers in | (441,864) | 0
Change in fair value, net | 0 | 0
Ending balance | (441,864) | 0
Fixed Index Annuities - Embedded Derivatives |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Coinsurance ceded, fixed index annuities embedded derivatives | 1,173,400 | 1,245,000
Fixed Index Annuities - Embedded Derivatives | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 7,964,961 | 7,938,281
Premiums less benefits | (125,940) | 1,424,372
Change in fair value, net | (2,561,676) | (876,803)
Reserve release related to in-force ceded reinsurance | (456,500) | (520,889)
Ending balance | $ 4,820,845 | $ 7,964,961

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + 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 (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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