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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Investments, amortized cost | $ 2,812,412 |  | $ 2,294,936 |  |  |
Investments in two sigma funds, cost | $ 829,606 |  | $ 770,191 |  |  |
Common stock authorized (in shares) | 150,000,000 | 150,000,000 | 150,000,000 | 150,000,000 | 135,000,000 | 135,000,000
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Common stock issued (in shares) | 101,392,722 | 101,922,771 | 110,225,103 | 103,704,006 | 103,683,894 | 103,087,859
Common stock outstanding (in shares) | 101,392,722 | 101,922,771 | 110,225,103 | 103,704,006 | 103,683,894 | 103,087,859
Total fixed maturities |  |  |  |  |  |
Investments, amortized cost | $ 2,306,168 |  | $ 1,867,499 |  |  |
Short-term investments |  |  |  |  |  |
Investments, amortized cost | $ 506,244 |  | $ 427,437 |  |  |
Common Class A |  |  |  |  |  |
Common stock authorized (in shares) | 26,944,807 | 28,644,807 | 28,644,807 | 53,993,690 | 53,993,690 | 53,993,690
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Common stock issued (in shares) | 17,820,078 | 19,520,078 | 28,644,807 | 30,520,078 | 30,520,078 | 30,520,078
Common stock outstanding (in shares) | 17,820,078 | 19,520,078 | 28,644,807 | 30,520,078 | 30,520,078 | 30,520,078
Common Class B |  |  |  |  |  |
Common stock authorized (in shares) | 79,677,932 | 72,837,352 | 72,337,352 | 65,480,684 | 50,480,684 | 50,480,684
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Common stock issued (in shares) | 63,668,995 | 57,358,464 | 56,036,067 | 42,658,302 | 42,638,190 | 42,042,155
Common stock outstanding (in shares) | 63,668,995 | 57,358,464 | 56,036,067 | 42,658,302 | 42,638,190 | 42,042,155
Common Class C |  |  |  |  |  |
Common stock authorized (in shares) | 19,903,649 | 25,044,229 | 25,544,229 | 30,525,626 | 30,525,626 | 30,525,626
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Common stock issued (in shares) | 19,903,649 | 25,044,229 | 25,544,229 | 30,525,626 | 30,525,626 | 30,525,626
Common stock outstanding (in shares) | 19,903,649 | 25,044,229 | 25,544,229 | 30,525,626 | 30,525,626 | 30,525,626

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