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Segment Information (Gross Premiums Earned and Reconciliation to Net Premiums) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Segment net premiums earned | $ 244,150 | $ 239,787
Specialty P&C Segment | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Ceded premiums earned | (17,739) | (20,369)
Segment net premiums earned | 188,888 | 183,684
Specialty P&C Segment | MPL | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 184,744 | 181,800
Specialty P&C Segment | Medical Technology Liability | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 10,938 | 10,546
Specialty P&C Segment | Lloyd's Syndicates | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 4,934 | 5,046
Specialty P&C Segment | Other | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 6,011 | 6,661
Workers' Compensation Insurance Segment | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Ceded premiums earned | (20,445) | (20,363)
Segment net premiums earned | 41,094 | 40,803
Workers' Compensation Insurance Segment | Traditional business | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 44,376 | 43,540
Workers' Compensation Insurance Segment | Alternative market business | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 17,163 | 17,626
Segregated Portfolio Cell Reinsurance Segment | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Ceded premiums earned | (2,242) | (2,303)
Segment net premiums earned | 14,168 | 15,300
Segregated Portfolio Cell Reinsurance Segment | MPL | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | 543 | 1,299
Segregated Portfolio Cell Reinsurance Segment | Workers' compensation | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums earned: | $ 15,867 | $ 16,304

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