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Loss and loss adjustment expense reserves - Schedule of loss and loss adjustment expense reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Loss and Loss Adjustment Expense Reserves [Abstract]    
Case loss and loss adjustment expense reserves $ 265,619 $ 148,166
Incurred but not reported loss and loss adjustment expense reserves 1,043,458 963,359
Deferred gains on retroactive reinsurance contracts 991 167
Loss and loss adjustment expense reserves $ 1,310,068 $ 1,111,692