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Segment reporting - Narrative (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenue, Major Customer [Line Items] |  |  |  |
Number of operating segments |  |  | 2 |
Number of contracts | 3 | 5 | 2 |
Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Contract One | Contract Concentration Risk | Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 20.50% | 22.70% |  | 18.00%
Contract Two | Contract Concentration Risk | Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 11.60% | 17.00% | 12.80% | 18.00%
Contract Three | Contract Concentration Risk | Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 14.60% |  | 11.50%
Contract Four | Contract Concentration Risk | Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage |  | 14.10% |  |
Contract Five | Contract Concentration Risk | Gross Premiums Written |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage |  | 14.00% |  |

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- Definition Number of Contracts + References No definition available. + Details
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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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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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