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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details) $ in Thousands | Jun. 30, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 955,437 | $ 784,933
Other liabilities | (34,430) | (13,327)
Total other assets and (liabilities) | 42,372 | 4,968
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 955,437 | 784,933
Total other assets and (liabilities) | 8,496 | 4,040
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 16,296,416 | 11,774,615
Fair Value, Measurements, Recurring | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 74,810 | 54,545
Other liabilities |  | (8,359)
Total other assets and (liabilities) | 7,942 |
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 82,752 | 46,186
Fair Value, Measurements, Recurring | Private equity investments |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 270,246 | 242,647
Fair Value, Measurements, Recurring | Private equity investments | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 74,810 | 54,545
Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 10,401 |
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 | 64,409 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities |  | (8,359)
Total other assets and (liabilities) | 7,942 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities |  | $ (8,359)
Total other assets and (liabilities) | 7,942 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Total other assets and (liabilities) | 382 |
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (9,396) |
Total other assets and (liabilities) | 400 |
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] |  |
Total other assets and (liabilities) | $ 16,956 |
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0 |
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 104.58 |
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External 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 | $ / shares | 104.01 |
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 | $ / shares | 0.125 |
Liquidity discount | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | 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 | 0.013 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 100.50 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 106.35 |
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | 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 | $ / shares | 103.73 |
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | 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 | 10,628,000 |
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | 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 | 0.371 |
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 | 0.000 |
Discount rate | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | 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 | 0.018 |

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