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Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) $ in Thousands		Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		(0.044)	0.003
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.196	0.030
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.018	0.012
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.0001	0.007
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.080	0.080
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.020	0.021
Available-for-sale Securities [Member] | Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value		$ 76,726	$ 54,135
Available-for-sale Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value		40,429	34,903
Available-for-sale Securities [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investment assets measured at fair value	[1]	173,165	162,244
Available-for-sale Securities [Member] | Investments [Member] | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value		$ 117,155	$ 89,038
[1] Other is comprised of broker quotes or other third-party pricing for which there is a lack of transparency into the inputs used to develop the valuations. The quantitative details of these unobservable inputs is neither provided to us, nor reasonably available to us, and therefore are not included in the tables above.

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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