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Segment, Geographic, and Product Line Information - Revenues by Underwriting Division (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net written premiums | $ 128,333 | $ 99,338 | $ 331,238 | $ 239,728
Operating Segments | Underwriting Division | Casualty |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net written premiums | 81,211 | 58,786 | 219,992 | 140,725
Operating Segments | Underwriting Division | Professional Liability |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net written premiums | 25,467 | 24,261 | 64,272 | 62,301
Operating Segments | Underwriting Division | Healthcare Liability |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net written premiums | 21,331 | 16,291 | 46,642 | 36,702
Operating Segments | Underwriting Division | Baleen Specialty |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net written premiums | $ 324 | $ 0 | $ 332 | $ 0

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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