Committed Capital

No definition available.

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- Definition

Committed Capital, Amount Called

+ References

No definition available.

+ Details

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- Definition

Ownership Percentage

+ References

No definition available.

+ Details

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- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b)(2),(c)(2)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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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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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ 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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Related party transactions (Details) (USD $)	3 Months Ended										9 Months Ended		12 Months Ended
Related party transactions (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Gross premiums written	$ 126,403,000us-gaap_AssumedPremiumsWritten	$ 162,277,000us-gaap_AssumedPremiumsWritten	$ 45,425,000us-gaap_AssumedPremiumsWritten	$ 98,215,000us-gaap_AssumedPremiumsWritten	$ 96,020,000us-gaap_AssumedPremiumsWritten	$ 27,895,000us-gaap_AssumedPremiumsWritten	$ 41,651,000us-gaap_AssumedPremiumsWritten	$ 28,178,000us-gaap_AssumedPremiumsWritten	$ 92,650,000us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten	$ 359,498,000us-gaap_AssumedPremiumsWritten	$ 239,660,000us-gaap_AssumedPremiumsWritten	$ 401,937,000us-gaap_AssumedPremiumsWritten	$ 190,374,000us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten
Narragansett Bay Insurance Company
Related Party Transaction [Line Items]
Gross premiums written											5,300,000	4,600,000	4,700,000	9,000,000
Pine Brook Road Partners, LLC
Related Party Transaction [Line Items]
Ownership percentage	12.00%	12.00%									12.00%		12.00%
Cayman Holdco
Related Party Transaction [Line Items]
Ownership percentage						10.00%								10.00%
Ownership percentage	10.50%	10.00%									10.50%		10.00%
Estimated fair value of investment	66,800,000	29,300,000				91,300,000					66,800,000		29,300,000	91,300,000
Third Point Loan L.L.C \| Investments in Securities and Derivative Contract
Related Party Transaction [Line Items]
Estimated fair value of investment	55,200,000	147,200,000				43,700,000					55,200,000		147,200,000	43,700,000
Third Point Hellenic Recovery US Feeder Fund, L.P.
Related Party Transaction [Line Items]
Ownership percentage	2.00%	2.00%									2.00%		2.00%
Committed capital	11,400,000	11,400,000									11,400,000		11,400,000
Committed capital, amount called											1,600,000		4,300,000
Estimated fair value of investment	$ 6,800,000	$ 5,300,000									$ 6,800,000		$ 5,300,000