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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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