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Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			4
Segregated portfolio cells dividend expense (income)	$ 8,811	$ 1,523	$ 11,186	$ 2,699
Income tax benefit (expense)	332	(5,413)	1,557	(6,777)
Premiums ceded under quota share agreement	$ 3,100	3,400	$ 6,600	7,000
Workers Compensation [Member]
Segment Reporting Information [Line Items]
Worker's compensation SPC percentage ceded	100.00%		100.00%
Lloyds Syndicate [Member]
Segment Reporting Information [Line Items]
Proportion of Capital Provided to support Lloyd's Syndicate 1729	58.00%		58.00%
Operating Segments [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	$ 2,698	1,277	$ 3,872	1,990
Operating Segments [Member] | Lloyds Syndicate [Member]
Segment Reporting Information [Line Items]
Income tax benefit (expense)	548	(812)	555	(897)
Operating Segments [Member] | Specialty Property and Casualty [Member]
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	5,119		5,091
Operating Segments [Member] | Specialty Property and Casualty [Member] | Previously Unrecognized Segregated Portfolilo Cells (SPC) Dividend Expense [Member]
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	5,200
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	994	246	2,223	709
Income tax benefit (expense)	(216)	$ (4,601)	$ 1,002	$ (5,880)
Operating Segments [Member] | Corporate [Member] | Previously Unrecognized Segregated Portfolilo Cells (SPC) Dividend Expense [Member]
Segment Reporting Information [Line Items]
Income tax benefit (expense)	$ 1,800

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Alternative Market Solutions Percentage Ceded

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Premiums Ceded Under Quota Share Agreement

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This item represents the capital provided in support of a segment by a corporate member as a percentage of total capital provided by all members to support the segment.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Income Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6515339

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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