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Investment Information - Net investment income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net investment income:        
Gross investment income $ 151,965 $ 176,498 $ 320,291 $ 359,276
Investment expenses (20,480) (21,460) (43,653) (47,289)
Net investment income 131,485 155,038 276,638 311,987
Fixed maturities        
Net investment income:        
Gross investment income 105,391 125,018 220,238 254,817
Term loans        
Net investment income:        
Gross investment income 20,512 24,730 43,682 49,346
Equity securities        
Net investment income:        
Gross investment income 6,219 4,368 12,226 7,356
Short-term investments        
Net investment income:        
Gross investment income 3,383 3,859 8,279 8,038
Other        
Net investment income:        
Gross investment income [1] $ 16,460 $ 18,523 $ 35,866 $ 39,719
[1]
Includes income distributions from investment funds and other items.