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Segment Information (Financial Data by Segment) (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
Net investment income | 23,186 | 25,440
Equity in earnings (loss) of unconsolidated subsidiaries | 1,808 | (3,634)
Net realized gains (losses) | 13,280 | (8,352)
Other income | 1,821 | 2,354
Net losses and loss adjustment expenses | (119,151) | (110,955)
Underwriting, policy acquisition and operating expenses | (57,108) | (56,889)
Segregated portfolio cells dividend (expense) income | (2,375) | (1,176)
Interest expense | (4,133) | (3,686)
Income tax benefit (expense) | 1,224 | (1,364)
Net income | 41,455 | 19,317
Depreciation and amortization, net of accretion | 7,803 | 8,630
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Segregated portfolio cells dividend (expense) income |  | (463)
Operating Segments [Member] | Specialty P&C [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums earned | 113,058 | 110,755
Other income | 1,198 | 1,276
Net losses and loss adjustment expenses | (74,994) | (71,174)
Underwriting, policy acquisition and operating expenses | (25,977) | (25,054)
Segregated portfolio cells dividend (expense) income | 28 |
Net income | 13,313 | 15,803
Depreciation and amortization, net of accretion | 1,911 | 2,011
Operating Segments [Member] | Workers Compensation [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums earned | 55,283 | 54,383
Other income | 145 | 471
Net losses and loss adjustment expenses | (34,650) | (35,027)
Underwriting, policy acquisition and operating expenses | (16,691) | (17,829)
Segregated portfolio cells dividend (expense) income | (1,174) | (713)
Net income | 2,913 | 1,285
Depreciation and amortization, net of accretion | 837 | 1,404
Operating Segments [Member] | Lloyds Syndicate [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums earned | 14,562 | 12,441
Net investment income | 372 | 315
Net realized gains (losses) | 27 | (5)
Other income | 391 | 252
Net losses and loss adjustment expenses | (9,507) | (6,189)
Underwriting, policy acquisition and operating expenses | (6,211) | (5,167)
Income tax benefit (expense) | 7 | (84)
Net income | (359) | 1,563
Depreciation and amortization, net of accretion | (3) | 66
Operating Segments [Member] | Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Net investment income | 22,814 | 25,125
Equity in earnings (loss) of unconsolidated subsidiaries | 1,808 | (3,634)
Net realized gains (losses) | 13,253 | (8,347)
Other income | 173 | 458
Underwriting, policy acquisition and operating expenses | (8,315) | (7,507)
Segregated portfolio cells dividend (expense) income | (1,229) |
Interest expense | (4,133) | (3,686)
Income tax benefit (expense) | 1,217 | (1,280)
Net income | 25,588 | 666
Depreciation and amortization, net of accretion | 5,058 | 5,149
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums earned | 0 | 0
Other income | (86) | (103)
Net losses and loss adjustment expenses | 0 | 1,435
Underwriting, policy acquisition and operating expenses | 86 | (1,332)
Net income | 0 | 0
Depreciation and amortization, net of accretion | $ 0 | $ 0

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