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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