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v3.21.2

Segment Information (Gross Premiums Earned and Reconciliation to Net Premiums) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Segment net premiums earned | $ 272,248 | $ 194,559 | $ 698,598 | $ 605,708
Specialty P&C |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Ceded premiums earned | (18,240) | (19,195) | (52,526) | (56,309)
Segment net premiums earned | 203,716 | 117,849 | 487,963 | 365,305
Specialty P&C | HCPL |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 184,893 | 101,785 | 432,722 | 317,088
Specialty P&C | Small Business Unit |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 26,958 | 26,372 | 78,789 | 77,937
Specialty P&C | Medical Technology Liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 9,933 | 8,749 | 28,484 | 25,918
Specialty P&C | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 172 | 138 | 494 | 671
Workers' Compensation Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Ceded premiums earned | (19,729) | (20,291) | (58,434) | (62,412)
Segment net premiums earned | 42,235 | 42,516 | 122,872 | 129,437
Workers' Compensation Insurance | Traditional business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 45,331 | 45,620 | 130,767 | 138,628
Workers' Compensation Insurance | Alternative market business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 16,633 | 17,187 | 50,539 | 53,221
Segregated Portfolio Cell Reinsurance Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Ceded premiums earned | (2,151) | (2,123) | (6,390) | (6,497)
Segment net premiums earned | 15,344 | 16,052 | 47,500 | 49,780
Segregated Portfolio Cell Reinsurance Segment | HCPL |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 1,649 | 1,699 | 5,675 | 5,099
Segregated Portfolio Cell Reinsurance Segment | Workers' compensation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 15,846 | 16,476 | 48,215 | 51,178
Lloyd's Syndicates Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums earned | 13,262 | 22,777 | 50,282 | 77,309
Ceded premiums earned | (2,309) | (4,635) | (10,019) | (16,123)
Segment net premiums earned | $ 10,953 | $ 18,142 | $ 40,263 | $ 61,186

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