Investments (Components of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Gross investment income, operating, net	$ 2,453,929	$ 2,101,892	$ 2,214,550
Less: investment expenses	(146,466)	(64,417)	(32,472)
Net investment income	2,307,463	2,037,475	2,182,078
Fixed Maturity Securities, Available For Sale
Net Investment Income [Line Items]
Gross investment income, operating, net	1,849,915	1,772,675	2,035,762
Real estate investments
Net Investment Income [Line Items]
Gross investment income, operating, net	40,243	14,138	0
Mortgage loans on real estate
Net Investment Income [Line Items]
Gross investment income, operating, net	301,118	215,138	170,749
Cash and Cash Equivalents
Net Investment Income [Line Items]
Gross investment income, operating, net	24,985	3,385	4,871
Limited partnerships and limited liability companies
Net Investment Income [Line Items]
Gross investment income, operating, net	188,131	67,157	(12,204)
Other investments
Net Investment Income [Line Items]
Gross investment income, operating, net	$ 49,537	$ 29,399	$ 15,372

Gross Investment Income, Operating, Net

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Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 944
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-Section S99
-Paragraph 1
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2))
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+ References

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