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Loss and loss adjustment expense reserves - Schedule of loss and loss adjustment expense reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Insurance Loss Reserves [Abstract]    
Case loss and loss adjustment expense reserves $ 148,166 $ 125,456
Incurred but not reported loss and loss adjustment expense reserves 963,359 811,280
Deferred gains on retroactive reinsurance contracts 167 421
Loss and loss adjustment expense reserves $ 1,111,692 $ 937,157