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Investments (Schedule of Investments in Other Ventures, under Equity Method) (Details) - USD ($) $ in Thousands		1 Months Ended			12 Months Ended
	Jul. 01, 2008	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 06, 1999
Schedule of Equity Method Investments [Line Items]
Investment					$ 153,732	$ 143,632
Investments in other ventures, under equity method					132,351	120,713
Equity method investee, additional contribution					10,150	(1,030)	$ 4,000
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Investment					64,750	64,750
Investments in other ventures, under equity method					50,587	50,656
THIG
Schedule of Equity Method Investments [Line Items]
Investment	$ 50,000				$ 50,000	$ 50,000
Ownership %	25.00%				25.00%	25.00%
Investments in other ventures, under equity method					$ 19,155	$ 20,811
Intangible Assets, Net	$ 40,000
Goodwill	$ 7,800
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Investment					$ 10,000	$ 10,000
Ownership %					31.30%	30.30%
Investments in other ventures, under equity method					$ 19,981	$ 18,991
Tower Hill Re
Schedule of Equity Method Investments [Line Items]
Investment					$ 4,250	$ 4,250
Ownership %					25.00%	25.00%
Investments in other ventures, under equity method					$ 4,136	$ 5,162
Tower Hill Signature
Schedule of Equity Method Investments [Line Items]
Investment					$ 500	$ 500
Ownership %					25.00%	25.00%
Investments in other ventures, under equity method					$ 7,315	$ 5,692
Top Layer Reinsurance Ltd.
Schedule of Equity Method Investments [Line Items]
Investment					$ 65,375	$ 65,375		$ 13,100
Ownership %					50.00%	50.00%		50.00%
Investments in other ventures, under equity method					$ 68,936	$ 60,911
Equity method investee, additional contribution		$ 18,000	$ 20,500	$ 13,800
Other
Schedule of Equity Method Investments [Line Items]
Investment					$ 23,607	$ 13,507
Ownership %					43.50%	36.30%
Investments in other ventures, under equity method					$ 12,828	$ 9,146

X

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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