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	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
States, municipalities and territories
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 222,217	$ 0
Purchases and sales, net	0	0
Transfers in	15,220	97,659
Transfers out	0	0
Included in net income	0	0
Included in other comprehensive income (loss)	(32,686)	0
Ending balance	204,751	97,659
Corporate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	255,437	402,348
Purchases and sales, net	23,369	(26,278)
Transfers in	2,396	347
Transfers out	(69,454)	0
Included in net income	0	0
Included in other comprehensive income (loss)	(1,432)	(1,120)
Ending balance	210,316	375,297
Residential mortgage backed securities
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	22,521	0
Transfers out	0	0
Included in net income	0	0
Included in other comprehensive income (loss)	0	0
Ending balance	22,521	0
Other asset backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,590,974	442,918
Purchases and sales, net	697,098	227,032
Transfers in	24,210	130,502
Transfers out	0	0
Included in net income	0	0
Included in other comprehensive income (loss)	(27,477)	7,776
Ending balance	2,284,805	808,228
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Transfers in	150,001	0
Transfers out	0	0
Included in net income	0	0
Included in other comprehensive income (loss)	0	0
Ending balance	150,001	0
Real estate investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,217,271	940,559
Purchases and sales, net	36,155	120,908
Included in net income	(4,723)	(7,836)
Ending balance	1,248,703	1,053,631
Limited partnerships and limited liability companies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	153,131	64,209
Purchases and sales, net	(1,635)	94,137
Included in net income	(8,841)	5,981
Ending balance	142,655	164,327
Funds withheld liability - embedded derivative
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(256,776)	(441,864)
Transfers in	0	0
Change in fair value, net	(41,478)	64,380
Ending balance	(298,254)	(377,484)
Fixed index annuities - embedded derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	5,181,894	4,820,845
Premiums less benefits	15,845	(121,181)
Change in fair value, net	75,668	205,469
Ending balance	$ 5,273,407	$ 4,905,133

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

No definition available.

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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).

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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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Amount of transfers of financial instrument classified as an asset out of 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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- Definition

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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