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Segment reporting - Customer Concentration (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written | $ 126,403 | $ 45,425 | $ 359,498 | $ 239,660
Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written | 126,403 | 45,425 | 359,498 | 239,660
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 359,498 | 239,660
Concentration risk, percentage |  |  | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk | Willis Re [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 55,589 | 13,421
Concentration risk, percentage |  |  | 15.50% | 5.60%
Gross Premiums Written | Customer Concentration Risk | Advocate Reinsurance Partners, LLC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 51,002 | 26,000
Concentration risk, percentage |  |  | 14.20% | 10.80%
Gross Premiums Written | Customer Concentration Risk | Stonehill Reinsurance Partners, LLC [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 44,744 | 0
Concentration risk, percentage |  |  | 12.40% | 0.00%
Gross Premiums Written | Customer Concentration Risk | Aon Benfield - a division of Aon plc |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 54,072 | 91,349
Concentration risk, percentage |  |  | 15.00% | 38.20%
Gross Premiums Written | Customer Concentration Risk | TigerRisk Partners LLC [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 13,852 | 10,472
Concentration risk, percentage |  |  | 3.90% | 4.40%
Gross Premiums Written | Customer Concentration Risk | Guy Carpenter & Company, LLC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 91,567 | (11,927)
Concentration risk, percentage |  |  | 25.50% | (5.00%)
Gross Premiums Written | Customer Concentration Risk | BMS Intermediaries |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 0 | 46,095
Concentration risk, percentage |  |  | 0.00% | 19.20%
Gross Premiums Written | Customer Concentration Risk | Other brokers |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 3,203 | 7,545
Concentration risk, percentage |  |  | 0.90% | 3.10%
Gross Premiums Written | Customer Concentration Risk | Total broker placed |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 314,029 | 182,955
Concentration risk, percentage |  |  | 87.40% | 76.30%
Gross Premiums Written | Customer Concentration Risk | Direct placements |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | $ 45,469 | $ 56,705
Concentration risk, percentage |  |  | 12.60% | 23.70%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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