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Segment Information (Gross Premiums Earned and Reconciliation to Net Premiums) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Segment net premiums earned	$ 242,420	$ 258,355	$ 730,068	$ 771,337
Specialty P&C Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(9,914)	(19,909)	(57,524)	(54,665)
Segment net premiums earned	195,772	198,481	562,206	593,534
Specialty P&C Segment | HCPL
Segment Reporting Information [Line Items]
Gross premiums earned:	163,343	172,984	494,658	514,027
Specialty P&C Segment | Small Business Unit
Segment Reporting Information [Line Items]
Gross premiums earned:	26,508	27,681	78,513	80,407
Specialty P&C Segment | Medical Technology Liability
Segment Reporting Information [Line Items]
Gross premiums earned:	10,904	10,911	32,060	30,879
Specialty P&C Segment | Lloyd's Syndicates
Segment Reporting Information [Line Items]
Gross premiums earned:	4,931	6,608	14,499	22,283
Specialty P&C Segment | Other
Segment Reporting Information [Line Items]
Gross premiums earned:	0	206	0	603
Workers' Compensation Insurance Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(20,849)	(21,900)	(62,338)	(64,062)
Segment net premiums earned	39,885	42,063	121,706	124,456
Workers' Compensation Insurance Segment | Traditional business
Segment Reporting Information [Line Items]
Gross premiums earned:	43,423	45,680	131,623	134,231
Workers' Compensation Insurance Segment | Alternative market business
Segment Reporting Information [Line Items]
Gross premiums earned:	17,311	18,283	52,421	54,287
Segregated Portfolio Cell Reinsurance Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(2,245)	(2,384)	(6,845)	(7,108)
Segment net premiums earned	6,763	17,811	46,156	53,347
Segregated Portfolio Cell Reinsurance Segment | HCPL
Segment Reporting Information [Line Items]
Gross premiums earned:	(6,971)	3,161	4,388	9,151
Segregated Portfolio Cell Reinsurance Segment | Workers' compensation
Segment Reporting Information [Line Items]
Gross premiums earned:	$ 15,979	$ 17,034	$ 48,613	$ 51,304

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