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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details) $ in Thousands | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($)
--- | --- | ---
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 1,122,683 | $ 1,087,377
Other liabilities | (18,116) | (28,213)
Assumed and ceded (re)insurance contracts | 11,508 | 32,944
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 1,122,683 | 1,087,377
Other liabilities | (8,081) |
Assumed and ceded (re)insurance contracts |  | 21,668
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 20,212,262 | 17,283,908
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (6,608) |
Fair Value, Measurements, Recurring | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 74,959 | 74,634
Other liabilities | (6,608) |
Assumed and ceded (re)insurance contracts |  | 4,731
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 68,351 | 79,365
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group one |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (934) |
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (7,842) |
Fair Value, Measurements, Recurring | Private equity investments |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 274,810 | 271,047
Fair Value, Measurements, Recurring | Private equity investments | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 74,959 | $ 74,634
Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 74,959 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assumed and ceded (re)insurance contracts | $ 2,168 |
Discount rate | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.003 |
Discount rate | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | $ / shares | 0.080 |
Liquidity discount | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group one |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.013 |
Liquidity discount | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | $ / shares | 0.150 |
Bond price | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group one |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | $ / shares | 92.24 |
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 12,133,000 |
Expected loss ratio | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.262 |
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.000 |

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