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Investment Information - Net investment income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net investment income:    
Gross investment income $ 125,966 $ 168,326
Investment expenses (27,110) (23,173)
Net investment income 98,856 145,153
Fixed maturities    
Net investment income:    
Gross investment income 90,626 114,847
Term loans    
Net investment income:    
Gross investment income 14,728 23,170
Equity securities    
Net investment income:    
Gross investment income 5,650 6,007
Short-term investments    
Net investment income:    
Gross investment income 607 4,896
Other    
Net investment income:    
Gross investment income [1] $ 14,355 $ 19,406
[1] Includes income distributions from investment funds and other items.