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Schedule III - Supplementary Insurance Information (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
Supplementary Insurance Information, by Segment [Line Items]                      
Net premiums earned                 $ 694,149 $ 699,731 $ 527,919
Net investment income                 108,660 125,557 129,265
Losses and loss adjustment expenses incurred related to current year, net of reinsurance $ 149,157 $ 145,027 $ 139,057 $ 138,654 $ 124,271 $ 142,124 $ 141,126 $ 137,647 571,891 545,168 447,510
Favorable development of reserves established in prior years, net (56,330) $ (36,221) $ (35,115) $ (33,514) (48,830) $ (42,902) $ (42,213) $ (48,139) (161,180) (182,084) (222,749)
Paid losses and loss adjustment expenses, net of reinsurance                 475,035 507,637 388,813
Underwriting, policy acquisition and operating expenses:                 79,556 68,577 53,207
Other underwriting, policy acquisition and operating expenses                 137,508 142,734 94,610
Net premiums written                 709,285 701,849 525,182
Deferred policy acquisition costs 44,388       38,790       44,388 38,790 28,207
Reserve for losses and loss adjustment expenses 2,005,326       2,058,266       2,005,326 2,058,266 2,072,822
Unearned premiums $ 362,066       $ 345,828       362,066 345,828 255,463
Inter-segment Eliminations [Member]                      
Supplementary Insurance Information, by Segment [Line Items]                      
Losses and loss adjustment expenses incurred related to current year, net of reinsurance                 (5,382) 0 0
Paid losses and loss adjustment expenses, net of reinsurance                 (5,416) 0 0
Underwriting, policy acquisition and operating expenses:                 24 0 0
Other underwriting, policy acquisition and operating expenses                 4,777 (481) (7)
Specialty Property and Casualty [Member]                      
Supplementary Insurance Information, by Segment [Line Items]                      
Net premiums earned                 443,313 492,733 527,919
Losses and loss adjustment expenses incurred related to current year, net of reinsurance                 409,149 408,987 447,510
Favorable development of reserves established in prior years, net                 (158,981) (180,788) (222,749)
Paid losses and loss adjustment expenses, net of reinsurance                 346,606 389,458 388,813
Underwriting, policy acquisition and operating expenses:                 45,459 55,105 53,207
Other underwriting, policy acquisition and operating expenses                 60,115 78,027 78,869
Net premiums written                 442,126 467,046 525,182
Workers Compensation [Member]                      
Supplementary Insurance Information, by Segment [Line Items]                      
Net premiums earned                 213,161 194,540 0
Losses and loss adjustment expenses incurred related to current year, net of reinsurance                 142,943 127,743 0
Favorable development of reserves established in prior years, net                 (2,199) (1,296) 0
Paid losses and loss adjustment expenses, net of reinsurance                 126,296 117,775 0
Underwriting, policy acquisition and operating expenses:                 26,232 10,307 0
Other underwriting, policy acquisition and operating expenses                 37,421 50,050 0
Net premiums written                 218,338 202,697 0
Lloyds Syndicate [Member]                      
Supplementary Insurance Information, by Segment [Line Items]                      
Net premiums earned                 37,675 12,458 0
Net investment income                 928 410 0
Losses and loss adjustment expenses incurred related to current year, net of reinsurance                 25,181 8,438 0
Paid losses and loss adjustment expenses, net of reinsurance                 7,549 404 0
Underwriting, policy acquisition and operating expenses:                 7,841 3,165 0
Other underwriting, policy acquisition and operating expenses                 10,677 6,370 0
Net premiums written                 48,821 32,106 0
Corporate Segment [Member]                      
Supplementary Insurance Information, by Segment [Line Items]                      
Net investment income                 107,732 125,147 129,265
Other underwriting, policy acquisition and operating expenses                 $ 24,518 $ 8,768 $ 15,748