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Segment Information (Gross Premiums Earned by Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Premiums ceded                 $ 101,510 $ 68,879 $ 41,514
Net premiums earned $ 164,874 $ 182,085 $ 175,293 $ 171,899 $ 174,670 $ 177,028 $ 176,303 $ 171,730 694,149 699,731 527,919
Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 443,313 492,733 527,919
Premiums ceded to Lloyd's Syndicate                 14,400 4,200  
Workers Compensation [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 213,161 194,540 0
Lloyds Syndicate [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 37,675 12,458 0
Operating Segments [Member] | Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Premiums ceded                 84,805 50,319 41,514
Net premiums earned                 443,313 492,733 527,919
Operating Segments [Member] | Workers Compensation [Member]                      
Segment Reporting Information [Line Items]                      
Premiums ceded                 25,122 21,793 0
Net premiums earned                 213,161 194,540 0
Operating Segments [Member] | Lloyds Syndicate [Member]                      
Segment Reporting Information [Line Items]                      
Premiums ceded                 5,942 971 0
Net premiums earned                 37,675 12,458 0
Operating Segments [Member] | Healthcare Professional Liability [Member] | Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 463,599 477,031 507,222
Operating Segments [Member] | Legal Professional Liability [Member] | Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 28,234 28,278 27,162
Operating Segments [Member] | Medical Technology and Life Sciences Product Liability [Member] | Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 34,838 35,913 33,242
Operating Segments [Member] | Other Premiums [Member] | Specialty Property and Casualty [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 1,447 1,830 1,807
Operating Segments [Member] | Workers' Compensation Traditional Business [Member] | Workers Compensation [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 172,115 160,717 0
Operating Segments [Member] | Workers' Compensation Alternative Market Business [Member] | Workers Compensation [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 66,168 55,616 0
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line [Member] | Lloyds Syndicate [Member]                      
Segment Reporting Information [Line Items]                      
Gross premiums earned                 $ 43,617 $ 13,429 $ 0