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Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Net premiums earned	$ 183,572us-gaap_PremiumsEarnedNet	$ 108,948us-gaap_PremiumsEarnedNet	$ 78,750us-gaap_PremiumsEarnedNet	$ 73,262us-gaap_PremiumsEarnedNet	$ 58,510us-gaap_PremiumsEarnedNet	$ 66,329us-gaap_PremiumsEarnedNet	$ 62,287us-gaap_PremiumsEarnedNet	$ 33,541us-gaap_PremiumsEarnedNet	$ 444,532us-gaap_PremiumsEarnedNet	$ 220,667us-gaap_PremiumsEarnedNet	$ 96,481us-gaap_PremiumsEarnedNet
Property and Casualty Reinsurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct gross premiums written									0	0	0
Ceded to other companies									150	9,975	0
Assumed from other companies									613,300	401,937	190,374
Net premiums earned									$ 613,150	$ 391,962	$ 190,374
Percentage of amount assumed to net									100.00%	97.51827%	100.00%

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.