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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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- Definition Amount of earned premiums ceded to other entities. + 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 + Details
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