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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Investments, amortized cost $ 2,077,885   $ 1,633,814      
Investments in Two Sigma Funds, cost $ 891,791   $ 731,100      
Common stock, par value (in dollars per share) $ 0.01          
Common stock authorized (in shares) 150,000,000 135,000,000 135,000,000 135,000,000 135,000,000 135,000,000
Common stock issued (in shares) 103,704,006 103,683,894 103,087,859 103,087,859 103,039,304 102,563,042
Common stock outstanding (in shares) 103,704,006 103,683,894 103,087,859 103,087,859 103,039,304 102,563,042
Total fixed maturities            
Investments, amortized cost $ 1,730,262   $ 1,348,684      
Short-term investments            
Investments, amortized cost $ 347,623   $ 285,130      
Common Class A            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01      
Common stock authorized (in shares) 53,993,690 53,993,690 53,993,690 53,993,690 53,993,690 53,793,690
Common stock issued (in shares) 30,520,078 30,520,078 30,520,078 30,520,078 30,520,078 30,320,078
Common stock outstanding (in shares) 30,520,078 30,520,078 30,520,078 30,520,078 30,520,078 30,320,078
Common Class B            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01      
Common stock authorized (in shares) 65,480,684 50,480,684 50,480,684 50,480,684 48,984,123 46,898,612
Common stock issued (in shares) 42,658,302 42,638,190 42,042,155 42,042,155 40,497,039 37,935,266
Common stock outstanding (in shares) 42,658,302 42,638,190 42,042,155 42,042,155 40,497,039 37,935,266
Common Class C            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01      
Common stock authorized (in shares) 30,525,626 30,525,626 30,525,626 30,525,626 32,022,187 34,307,698
Common stock issued (in shares) 30,525,626 30,525,626 30,525,626 30,525,626 32,022,187 34,307,698
Common stock outstanding (in shares) 30,525,626 30,525,626 30,525,626 30,525,626 32,022,187 34,307,698