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Fair Value (Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets) (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Fair Value	$ 6,612,107	$ 6,709,976
Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Fair Value	2,335,025	2,573,603
Corporate Securities [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Level 3 Securities	187,980	114,127	$ 70,700
Collateralized Loan Obligations and Other Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Fair Value	1,485,973	1,350,814
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Level 3 Securities	153,342	124,909	56,375
Valuation Technique, Discounted Cash Flow | Corporate Securities [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	81,867	54,135
Valuation Technique, Discounted Cash Flow | Collateralized Loan Obligations and Other Asset-Backed Securities [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 59,452	$ 34,903
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	(0.044)	0.003
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum [Member] | Collateralized Loan Obligations and Other Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.0001	0.007
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.053	0.030
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum [Member] | Collateralized Loan Obligations and Other Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.196	0.080
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.013	(0.012)
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average | Collateralized Loan Obligations and Other Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.025	(0.021)
Investments [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investment assets measured at fair value	$ 207,936	$ 162,244
Total Level 3 Securities	349,255	251,282	$ 129,969
Investments [Member] | Valuation Technique, Discounted Cash Flow | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 141,319	$ 89,038

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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