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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%

X

- 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

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X

- 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

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