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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, 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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