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	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
States, municipalities and territories
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 97,659	$ 0	$ 0	$ 0
Purchases and sales, net	0	0	0	0
Transfers in	11,164	77,726	108,823	77,726
Transfers out	0	0	0	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	20,480	0	20,480	0
Ending balance	129,303	77,726	129,303	77,726
Corporate securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	375,297	0	402,348	0
Purchases and sales, net	0	0	(26,278)	0
Transfers in	49,326	0	49,673	0
Transfers out	(172,174)	0	(172,174)	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	(1,312)	0	(2,432)	0
Ending balance	251,137	0	251,137	0
Other asset backed securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	808,228	0	442,918	0
Purchases and sales, net	0	0	227,032	0
Transfers in	0	64,550	130,502	64,550
Transfers out	(20,817)	0	(20,817)	0
Included in net income	0	0	0	0
Included in other comprehensive income (loss)	(44,487)	0	(36,711)	0
Ending balance	742,924	64,550	742,924	64,550
Other investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	3,867	0	6,349
Transfers in	9,821	0	9,821	0
Transfers out	0	(3,867)	0	(3,867)
Included in net income	0	0	0	(2,482)
Included in other comprehensive income (loss)	13,423	0	13,423	0
Ending balance	23,244	0	23,244	0
Real estate investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,053,631	510,188	940,559	337,939
Purchases and sales, net	108,825	135,478	229,733	303,566
Included in net income	(3,684)	26,809	(11,520)	30,970
Ending balance	1,158,772	672,475	1,158,772	672,475
Limited partnerships and limited liability companies
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	164,327	0	64,209	0
Purchases and sales, net	3,339	0	97,476	0
Included in net income	(16,626)	0	(10,645)	0
Ending balance	151,040	0	151,040	0
Funds withheld liability - embedded derivative
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(377,484)	0	(441,864)	0
Transfers in	0	0	0	0
Change in fair value, net	(19,750)	0	44,630	0
Ending balance	(397,234)	0	(397,234)	0
Fixed index annuities - embedded derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	4,905,133	6,770,915	4,820,845	7,964,961
Premiums less benefits	(32,309)	(50,594)	(153,490)	63,483
Change in fair value, net	141,873	(884,009)	347,342	(2,192,132)
Ending balance	$ 5,014,697	$ 5,836,312	$ 5,014,697	$ 5,836,312

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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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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- 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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