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Segment reporting - Geographic information (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 from External Customer [Line Items]
Gross premiums written	$ 145,508	$ 98,215	$ 233,095	$ 194,235
Gross Premiums Written
Revenue from External 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 | United States
Revenue from External Customer [Line Items]
Gross premiums written	144,657	93,992	202,734	143,650
Concentration risk, percentage	99.40%	95.70%	87.00%	74.00%
Gross Premiums Written | United Kingdom
Revenue from External Customer [Line Items]
Gross premiums written	575	0	25,413	0
Concentration risk, percentage	0.40%	0.00%	10.90%	0.00%
Gross Premiums Written | Bermuda
Revenue from External Customer [Line Items]
Gross premiums written	276	4,223	4,948	49,185
Concentration risk, percentage	0.20%	4.30%	2.10%	25.30%
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%	0.70%

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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