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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) $ in Thousands | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | $ 1,087,377 | $ 784,933
Other liabilities | (28,213) | (13,327)
Other assets and (liabilities) | 32,944 | 4,968
Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 1,087,377 | 784,933
Other assets and (liabilities) | 21,668 | 4,040
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 17,283,908 | 11,774,615
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 74,634 | 54,545
Other liabilities |  | (8,359)
Other assets and (liabilities) | 4,731 |
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 79,365 | 46,186
Fair Value, Measurements, Recurring | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 74,634 |
Fair Value, Measurements, Recurring | Private equity investments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 271,047 | 242,647
Fair Value, Measurements, Recurring | Private equity investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 74,634 | 54,545
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 | 10,327 |
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 | 64,307 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities |  | (8,359)
Other assets and (liabilities) | 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 |  | $ (8,359)
Other assets and (liabilities) | 4,731 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other assets and (liabilities) | 501 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (8,767) |
Other assets and (liabilities) | 500 |
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 and (liabilities) | $ 12,997 |
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Significant Unobservable Inputs (Level 3) | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 103.20 |
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Significant Unobservable Inputs (Level 3) | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 103.77 |
Manager pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 103.20 |
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.080 |
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.100 |
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.090 |
Discount rate | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.017 |
Liquidity discount | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.150 |
Liquidity discount | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.013 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Significant Unobservable Inputs (Level 3) | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 100.29 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Significant Unobservable Inputs (Level 3) | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 106.26 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 103.58 |
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | (11,179,000) |
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.331 |
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.000 |

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