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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net premiums earned	$ 182,903	$ 177,579
Healthcare professional liability [Member] | Specialty P&C [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	117,051	113,749
Legal professional liability [Member] | Specialty P&C [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	6,317	6,614
Medical technology and life sciences product liability [Member] | Specialty P&C [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	8,312	8,550
Other [Member] | Specialty P&C [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	102	268
Traditional business [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	41,768	42,650
Alternative market business [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	19,446	18,294
Operating Segments [Member] | Specialty P&C [Member]
Segment Reporting Information [Line Items]
Ceded premiums earned	(18,724)	(18,426)
Net premiums earned	113,058	110,755
Operating Segments [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Ceded premiums earned	(5,931)	(6,561)
Net premiums earned	55,283	54,383
Operating Segments [Member] | Lloyds Syndicate [Member]
Segment Reporting Information [Line Items]
Ceded premiums earned	(2,623)	(932)
Net premiums earned	14,562	12,441
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line [Member] | Lloyds Syndicate [Member]
Segment Reporting Information [Line Items]
Gross premiums earned	$ 17,185	$ 13,373

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.1)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b),(c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-17)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.1)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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