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Investment Information - Net investment income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net investment income:    
Gross investment income $ 102,942 $ 125,966
Investment expenses (22,506) (27,110)
Net investment income 80,436 98,856
Fixed maturities    
Net investment income:    
Gross investment income 82,053 90,626
Term loans    
Net investment income:    
Gross investment income 1,617 14,728
Equity securities    
Net investment income:    
Gross investment income 6,238 5,650
Short-term investments    
Net investment income:    
Gross investment income 2,575 607
Other    
Net investment income:    
Gross investment income [1] $ 10,459 $ 14,355
[1] Includes income distributions from investment funds and other items.