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Investment Information - Fair value option (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments accounted for using the fair value option $ 3,749,575 $ 3,663,477
Fixed maturities    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments accounted for using the fair value option 1,019,529 754,452
Other investments    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments accounted for using the fair value option 2,169,897 2,429,316
Short-term investments    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments accounted for using the fair value option 468,704 377,014
Equity securities    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments accounted for using the fair value option $ 91,445 $ 102,695