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Short Duration Contracts - Reconciliation of claims development to liability (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | $ 13,445,271 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 6,278,825 | $ 5,599,231 | $ 4,314,855 | $ 4,082,650
Lines other than short duration |  | 102,283 |  |  |
Discounting |  | (60,536) |  |  |
Unallocated claims adjustment expenses |  | 266,100 |  |  |
Total reconciling items |  | 307,847 |  |  |
Reserve for losses and loss adjustment expenses |  | 20,031,943 | $ 17,757,156 | $ 16,513,929 | $ 13,891,842
Other short duration lines not included |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 301,222 |  |  |
Unpaid losses and loss adjustment expenses recoverable | [1] | 560,642 |  |  |
Other short duration lines not included | Loss portfolio transfer |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses recoverable | [1] | 280,200 |  |  |
Total for short duration lines |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 6,278,825 |  |  |
Insurance | Property, energy, marine and aviation |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 750,461 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 423,740 |  |  |
Insurance | Third party occurrence business |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 3,184,995 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 1,761,871 |  |  |
Insurance | Third party claims-made business |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 1,991,302 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 995,921 |  |  |
Insurance | Multi-line and other specialty |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 1,215,721 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 173,051 |  |  |
Reinsurance | Casualty |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 2,323,825 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 684,663 |  |  |
Reinsurance | Property catastrophe |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 535,158 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 595,740 |  |  |
Reinsurance | Property excluding property catastrophe |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 1,010,604 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 206,867 |  |  |
Reinsurance | Marine and aviation |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 289,944 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 186,416 |  |  |
Reinsurance | Other specialty |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 1,444,921 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 656,130 |  |  |
Mortgage |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance |  | 397,118 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 37,531 |  |  |
Consolidating adjustments and eliminations |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | $ (3,747) |  |  |
[1] | Includes unpaid loss and loss adjustment expenses recoverable of $280.2 million related to the loss portfolio transfer reinsurance agreements.

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