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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 |  |  |

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