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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

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- Definition Amount of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Payments of claims and claims adjustment expenses during the period of a property-casualty insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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