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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investment income from portfolios        
Equity in earnings (losses) of limited partnerships $ 6,151 $ (2,329) $ 15,197 $ (6,034)
Total investment income 13,992 5,357 31,414 10,270
Less: investment expenses 342 313 667 562
Net investment income 13,650 5,044 30,747 9,708
Available-for-sale securities        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other 5,790 5,670 11,987 11,458
Equity securities        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other 1,116 901 2,318 1,757
Cash equivalents and other        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other $ 935 $ 1,115 $ 1,912 $ 3,089