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Loss and loss adjustment expense reserves - Reconciliation of loss development information to reserves for loss and loss adjustment expense reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year $ 1,289,699      
Loss and loss adjustment expenses recoverable, net 14,375 $ 5,520 $ 2,031 $ 1,113
Deferred Costs 5,994 6,738 3,847 0
Gross reserves for loss and loss adjustment expenses, end of year 1,310,068 $ 1,111,692 $ 937,157 $ 720,570
Global A&H        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 3,681      
Loss and loss adjustment expenses recoverable, net 0      
Marine & Energy        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 12,095      
Loss and loss adjustment expenses recoverable, net 0      
Credit        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 45,553      
Loss and loss adjustment expenses recoverable, net 2,373      
Casualty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 616,013      
Loss and loss adjustment expenses recoverable, net 8,982      
Other Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 263,418      
Loss and loss adjustment expenses recoverable, net 0      
Property Catastrophe Excess Reinsurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 75,848      
Loss and loss adjustment expenses recoverable, net 218      
Property Risk and Pro Rata        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 59,514      
Loss and loss adjustment expenses recoverable, net 2,801      
Agriculture        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 2      
Loss and loss adjustment expenses recoverable, net 1      
Other        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 2,863      
Loss and loss adjustment expenses recoverable, net 0      
Retroactive reinsurance contracts | Contracts incepting in 2012        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 0      
Retroactive reinsurance contracts | Contracts incepting in 2013        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 0      
Retroactive reinsurance contracts | Contracts incepting in 2014        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 0      
Retroactive reinsurance contracts | Contracts incepting in 2015        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 29,436      
Retroactive reinsurance contracts | Contracts incepting in 2016        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 0      
Retroactive reinsurance contracts | Contracts incepting in 2017        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 54,899      
Retroactive reinsurance contracts | Contracts incepting in 2018        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 2,043      
Retroactive reinsurance contracts | Contracts incepting in 2019        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year 104,646      
Retroactive reinsurance contracts | Contracts incepting in 2020        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net reserves for loss and loss adjustment expenses, end of year $ 19,688