Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
States, municipalities and territories
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 0
Purchases and sales, net	0	0
Transfers in	203,757	0
Transfers out	(2,001)	0
Included in net income	0	0
Included in other comprehensive income (loss)	20,461	0
Ending balance	222,217	0
Corporate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	402,348	0
Purchases and sales, net	(45,187)	2,233
Transfers in	82,866	391,702
Transfers out	(172,174)	0
Included in net income	0	0
Included in other comprehensive income (loss)	(12,416)	8,413
Ending balance	255,437	402,348
Other asset backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	442,918	0
Purchases and sales, net	1,071,824	296,800
Transfers in	160,160	153,669
Transfers out	(20,817)	0
Included in net income	0	0
Included in other comprehensive income (loss)	(63,111)	(7,551)
Ending balance	1,590,974	442,918
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	6,349
Transfers in	9,821	0
Transfers out	(23,244)	(3,867)
Included in net income	0	(2,482)
Included in other comprehensive income (loss)	13,423	0
Ending balance	0	0
Real estate investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	940,559	337,939
Purchases and sales, net	313,235	602,298
Included in net income	(36,523)	322
Ending balance	1,217,271	940,559
Limited partnerships and limited liability companies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	64,209	0
Purchases and sales, net	99,963	57,574
Included in net income	(11,041)	6,635
Ending balance	153,131	64,209
Funds Withheld Liability - Embedded Derivative
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(441,864)	0
Transfers in	0	(441,864)
Change in fair value, net	185,088	0
Ending balance	(256,776)	(441,864)
Fixed Index Annuities - Embedded Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	4,820,845	7,964,961
Premiums less benefits	(177,559)	(125,940)
Change in fair value, net	538,608	(2,561,676)
Reserve release related to in-force ceded reinsurance	0	(456,500)
Ending balance	$ 5,181,894	$ 4,820,845

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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