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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Value of input used to measure 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
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Fair value portion of other assets.

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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Corporate Securities [Member] \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 114,127	$ 70,700	$ 17,051
Corporate Securities [Member] \| Valuation Technique, Discounted Cash Flow \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	54,135	15,907
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	124,909	56,375	17,034
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] \| Valuation Technique, Discounted Cash Flow \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	34,903	27,005
Investments [Member] \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Assets, Fair Value Disclosure	162,244	87,057
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	251,282	129,969	$ 34,085
Investments [Member] \| Valuation Technique, Discounted Cash Flow \| Available-for-sale Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 89,038	$ 42,912
Minimum [Member] \| Corporate Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.003	0.018
Minimum [Member] \| Collateralized Loan Obligations and Other Asset-Backed Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.007	0.012
Maximum [Member] \| Corporate Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.030	0.018
Maximum [Member] \| Collateralized Loan Obligations and Other Asset-Backed Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.080	0.031
Weighted Average \| Corporate Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	(0.012)	(0.018)
Weighted Average \| Collateralized Loan Obligations and Other Asset-Backed Securities [Member] \| Measurement Input, Credit Spread \| Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	(0.021)	(0.018)