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Related party transactions (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Narragansett Bay Insurance Company | Sep. 30, 2013 Narragansett Bay Insurance Company | Sep. 30, 2014 Pine Brook Road Partners, LLC | Dec. 31, 2013 Pine Brook Road Partners, LLC | Sep. 30, 2014 Third Point Loan L.L.C Investments in Securities and Derivative Contract | Dec. 31, 2013 Third Point Loan L.L.C Investments in Securities and Derivative Contract
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 126,403,000 | $ 45,425,000 | $ 359,498,000 | $ 239,660,000 | $ 5,300,000 | $ 4,600,000 |  |  |  |
Ownership percentage |  |  |  |  |  |  | 12.00% | 12.00% |  |
Estimated fair value of investment |  |  |  |  |  |  |  |  | $ 55,200,000 | $ 147,200,000

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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 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 + Details
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