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Segment Information (Financial Data by Segment) (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] |  |  |  |  |  |  |  |  |  |  |
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
Net investment income |  |  |  |  |  |  |  |  | 108,660 | 125,557 | 129,265
Equity in earnings (loss) of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 3,682 | 3,986 | 7,539
Net realized gains (losses) |  |  |  |  |  |  |  |  | (41,639) | 14,654 | 67,904
Other income (loss) |  |  |  |  |  |  |  |  | 7,227 | 8,398 | 7,551
Gain on acquisition |  |  |  |  |  |  |  |  | 0 | 0 | 32,314
Net losses and loss adjustment expenses |  |  |  |  |  |  |  |  | (410,711) | (363,084) | (224,761)
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (217,064) | (211,311) | (147,817)
Segregated portfolio cells dividend (expense) income |  |  |  |  |  |  |  |  | (853) | (1,842) | 0
Interest expense |  |  |  |  |  |  |  |  | (14,596) | (14,084) | (2,755)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 0
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (12,658) | (65,440) | (99,636)
Segment operating results |  |  |  |  |  |  |  |  | 116,197 | 196,565 | 297,523
Depreciation and amortization |  |  |  |  |  |  |  |  | 36,400 | 39,594 | 35,833
Specialty Property and Casualty [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 443,313 | 492,733 | 527,919
Segment operating results |  |  |  |  |  |  |  |  | 92,132 | 137,225 | 176,730
Workers Compensation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 213,161 | 194,540 | 0
Segment operating results |  |  |  |  |  |  |  |  | 8,403 | 6,539 | 0
Lloyds Syndicate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 37,675 | 12,458 | 0
Segment operating results |  |  |  |  |  |  |  |  | (5,614) | (4,975) | 0
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating results |  |  |  |  |  |  |  |  | 21,276 | 57,776 | 120,793
Inter-segment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 |
Other income (loss) |  |  |  |  |  |  |  |  | (581) | (481) | (7)
Net losses and loss adjustment expenses |  |  |  |  |  |  |  |  | 5,382 |  |
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (4,801) | 481 | 7
Segment operating results |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Segments [Member] | Specialty Property and Casualty [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 443,313 | 492,733 | 527,919
Other income (loss) |  |  |  |  |  |  |  |  | 4,561 | 5,823 | 5,648
Net losses and loss adjustment expenses |  |  |  |  |  |  |  |  | (250,168) | (228,199) | (224,761)
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (105,574) | (133,132) | (132,076)
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,663 | 8,945 | 7,199
Operating Segments [Member] | Workers Compensation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 213,161 | 194,540 | 0
Other income (loss) |  |  |  |  |  |  |  |  | 492 | 645 | 0
Net losses and loss adjustment expenses |  |  |  |  |  |  |  |  | (140,744) | (126,447) | 0
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (63,653) | (60,357) | 0
Segregated portfolio cells dividend (expense) income |  |  |  |  |  |  |  |  | (853) | (1,842) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,696 | 5,828 | 0
Operating Segments [Member] | Lloyds Syndicate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 37,675 | 12,458 | 0
Net investment income |  |  |  |  |  |  |  |  | 928 | 410 | 0
Net realized gains (losses) |  |  |  |  |  |  |  |  | 24 | 4 |
Other income (loss) |  |  |  |  |  |  |  |  | 698 | 126 | 0
Net losses and loss adjustment expenses |  |  |  |  |  |  |  |  | (25,181) | (8,438) | 0
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (18,518) | (9,535) | 0
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (1,240) |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 417 | 477 | 0
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 107,732 | 125,147 | 129,265
Equity in earnings (loss) of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 3,682 | 3,986 | 7,539
Net realized gains (losses) |  |  |  |  |  |  |  |  | (41,663) | 14,650 | 67,904
Other income (loss) |  |  |  |  |  |  |  |  | 2,057 | 2,285 | 1,910
Gain on acquisition |  |  |  |  |  |  |  |  |  | 0 | 32,314
Underwriting, policy acquisition and operating expenses |  |  |  |  |  |  |  |  | (24,518) | (8,768) | (15,748)
Interest expense |  |  |  |  |  |  |  |  | (14,596) | (14,084) | (2,755)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 0
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (11,418) | (65,440) | (99,636)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 21,624 | $ 24,344 | $ 28,634

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