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Loss and loss adjustment expense reserves - Schedule of loss and loss adjustment expense reserves (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Loss and Loss Adjustment Expense Reserves [Abstract]      
Case loss and loss adjustment expense reserves $ 50,868us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount $ 34,307us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount $ 3,668us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount
Incurred but not reported loss and loss adjustment expense reserves 136,445us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount 100,024us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount 63,603us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Loss and loss adjustment expense reserves $ 187,313us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability $ 134,331us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability $ 67,271us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability