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	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
States, municipalities and territories
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 129,303	$ 0	$ 0	$ 0
Purchases and sales, net	0	0	0	0
Transfers in	0	0	108,823	0
Transfers out	0	0	0	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	(7,429)	0	13,051	0
Ending balance	121,874	0	121,874	0
Corporate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	251,137	77,726	402,348	0
Purchases and sales, net	0	0	(26,278)	0
Transfers in	17,281	241,878	66,954	319,604
Transfers out	0	0	(172,174)	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	(16,578)	(72)	(19,010)	(72)
Ending balance	251,840	319,532	251,840	319,532
Other asset backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	742,924	64,550	442,918	0
Purchases and sales, net	0	0	227,032	0
Transfers in	23,244	37,151	153,746	101,701
Transfers out	0	0	(20,817)	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	(13,108)	(3,456)	(49,819)	(3,456)
Ending balance	753,060	98,245	753,060	98,245
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23,244	0	0	6,349
Transfers in	0	0	9,821	0
Transfers out	(23,244)	0	(23,244)	(3,867)
Included in net income	0	0	0	(2,482)
Included in other comprehensive income (loss)	0	0	13,423	0
Ending balance	0	0	0	0
Real estate investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,158,772	672,475	940,559	337,939
Purchases and sales, net	27,396	250,062	257,129	553,628
Included in net income	5,087	(24,864)	(6,433)	6,106
Ending balance	1,191,255	897,673	1,191,255	897,673
Limited partnerships and limited liability companies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	151,040	0	64,209	0
Purchases and sales, net	1,260	0	98,736	0
Included in net income	(3,466)	0	(14,111)	0
Ending balance	148,834	0	148,834	0
Funds withheld liability - embedded derivative
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(397,234)	0	(441,864)	0
Transfers in	0	(520,458)	0	(520,458)
Change in fair value, net	(128,726)	0	(84,096)	0
Ending balance	(525,960)	(520,458)	(525,960)	(520,458)
Fixed index annuities - embedded derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	5,014,697	5,836,312	4,820,845	7,964,961
Premiums less benefits	(23,488)	(92,242)	(176,978)	(28,759)
Change in fair value, net	(387,018)	(466,244)	(39,676)	(2,658,376)
Reserve release related to in-force ceded reinsurance	0	(20,784)	0	(20,784)
Ending balance	$ 4,604,191	$ 5,257,042	$ 4,604,191	$ 5,257,042

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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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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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 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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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of 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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