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Segment reporting - Customer Concentration (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written | $ 145,508 | $ 98,215 | $ 233,095 | $ 194,235
Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written | 145,508 | 98,215 | 233,095 | 194,235
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 |  |  | 233,095 | 194,235
Concentration risk, percentage |  |  | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk | Willis Re [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 57,047 | 13,421
Concentration risk, percentage |  |  | 24.50% | 6.90%
Gross Premiums Written | Customer Concentration Risk | Advocate Reinsurance Partners, LLC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 53,004 | 27,647
Concentration risk, percentage |  |  | 22.70% | 14.20%
Gross Premiums Written | Customer Concentration Risk | Stonehill Reinsurance Partners, LLC [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 46,659 | 0
Concentration risk, percentage |  |  | 20.00% | 0.00%
Gross Premiums Written | Customer Concentration Risk | Aon Benfield - a division of Aon plc |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 16,793 | 81,357
Concentration risk, percentage |  |  | 7.20% | 41.90%
Gross Premiums Written | Customer Concentration Risk | TigerRisk Partners LLC [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 14,496 | 9,531
Concentration risk, percentage |  |  | 6.20% | 4.90%
Gross Premiums Written | Customer Concentration Risk | Guy Carpenter & Company, LLC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 15,074 | (11,057)
Concentration risk, percentage |  |  | 6.50% | (5.70%)
Gross Premiums Written | Customer Concentration Risk | BMS Intermediaries |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 0 | 10,019
Concentration risk, percentage |  |  | 0.00% | 5.20%
Gross Premiums Written | Customer Concentration Risk | Other brokers |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 2,984 | 7,097
Concentration risk, percentage |  |  | 1.30% | 3.70%
Gross Premiums Written | Customer Concentration Risk | Total broker placed |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | 206,057 | 138,015
Concentration risk, percentage |  |  | 88.40% | 71.10%
Gross Premiums Written | Customer Concentration Risk | Direct placements |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gross premiums written |  |  | $ 27,038 | $ 56,220
Concentration risk, percentage |  |  | 11.60% | 28.90%

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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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