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Investment Information - Net investment income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net investment income:    
Gross investment income $ 168,326 $ 182,778
Investment expenses (23,173) (25,829)
Net investment income 145,153 156,949
Fixed maturities    
Net investment income:    
Gross investment income 114,847 129,799
Term loans    
Net investment income:    
Gross investment income 23,170 24,616
Equity securities    
Net investment income:    
Gross investment income 6,007 2,988
Short-term investments    
Net investment income:    
Gross investment income 4,896 4,179
Other    
Net investment income:    
Gross investment income [1] $ 19,406 $ 21,196
[1]
Includes income distributions from investment funds and other items.