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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) $ in Thousands | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | $ 1,256,948 | $ 1,087,377
Other liabilities | (15,193) | (28,213)
Other assets | 8,982 | 32,944
Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 1,256,948 | 1,087,377
Other assets | 16,662 | 21,668
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 20,476,465 | 17,283,908
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (6,211) |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 79,807 | 74,634
Other liabilities | (6,211) |
Other assets |  | 4,731
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 73,596 | 79,365
Fair Value, Measurements, Recurring | Private equity investments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 345,501 | 271,047
Fair Value, Measurements, Recurring | Private equity investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 79,807 | 74,634
Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 79,800 |
Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 79,807 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (6,211) |
Other assets |  | 4,731
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (6,211) |
Other assets |  | $ 4,731
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other assets | $ 1,374 |
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.090 |
Liquidity discount | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.150 |
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.000 |

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