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Segment Information (Gross Premiums Earned and Reconciliation to Net Premiums) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Segment net premiums earned	$ 247,271	$ 238,993	$ 512,982	$ 426,351
Specialty P&C Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(18,308)	(17,839)	(32,620)	(34,285)
Segment net premiums earned	183,547	168,635	381,514	284,249
Specialty P&C Segment | HCPL
Segment Reporting Information [Line Items]
Gross premiums earned	165,496	150,784	341,043	247,829
Specialty P&C Segment | Small Business Unit
Segment Reporting Information [Line Items]
Gross premiums earned	26,188	25,905	52,726	51,831
Specialty P&C Segment | Medical Technology Liability
Segment Reporting Information [Line Items]
Gross premiums earned	9,968	9,613	19,968	18,551
Specialty P&C Segment | Other
Segment Reporting Information [Line Items]
Gross premiums earned	203	172	397	323
Workers' Compensation Insurance Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(21,812)	(20,084)	(42,162)	(38,706)
Segment net premiums earned	41,709	40,626	82,393	80,636
Workers' Compensation Insurance Segment | Traditional business
Segment Reporting Information [Line Items]
Gross premiums earned	45,395	43,693	88,551	85,436
Workers' Compensation Insurance Segment | Alternative market business
Segment Reporting Information [Line Items]
Gross premiums earned	18,126	17,017	36,004	33,906
Segregated Portfolio Cell Reinsurance Segment
Segment Reporting Information [Line Items]
Ceded premiums earned	(2,374)	(2,155)	(4,724)	(4,238)
Segment net premiums earned	16,222	16,272	35,536	32,156
Segregated Portfolio Cell Reinsurance Segment | HCPL
Segment Reporting Information [Line Items]
Gross premiums earned	1,504	2,173	5,990	4,026
Segregated Portfolio Cell Reinsurance Segment | Workers' compensation
Segment Reporting Information [Line Items]
Gross premiums earned	17,092	16,254	34,270	32,368
Lloyd's Syndicates Segment
Segment Reporting Information [Line Items]
Gross premiums earned	6,443	16,635	15,675	37,020
Ceded premiums earned	(650)	(3,175)	(2,136)	(7,710)
Segment net premiums earned	$ 5,793	$ 13,460	$ 13,539	$ 29,310

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