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Segment reporting - Geographic information (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 from External Customer [Line Items]
Gross premiums written	$ 126,403	$ 45,425	$ 359,498	$ 239,660
Gross Premiums Written
Revenue from External 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 | United States
Revenue from External Customer [Line Items]
Gross premiums written	85,686	7,665	288,420	151,314
Concentration risk, percentage	67.70%	16.90%	80.30%	63.10%
Gross Premiums Written | United Kingdom
Revenue from External Customer [Line Items]
Gross premiums written	(812)	0	24,600	0
Concentration risk, percentage	(0.60%)	0.00%	6.80%	0.00%
Gross Premiums Written | Bermuda
Revenue from External Customer [Line Items]
Gross premiums written	41,529	37,760	46,478	86,946
Concentration risk, percentage	32.90%	83.10%	12.90%	36.30%
Gross Premiums Written | Other
Revenue from External Customer [Line Items]
Gross premiums written	$ 0	$ 0	$ 0	$ 1,400
Concentration risk, percentage	0.00%	0.00%	0.00%	0.60%

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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