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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 ($)
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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) |

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