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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

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