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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