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Reserve for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | $ (8,903) | $ (3,522) |  |
Acquisition costs | $ 78,537 | $ 65,735 | 220,532 | 194,795 |  |
Reserve for losses and loss adjustment expenses | 2,948,822 | $ 2,756,197 | 2,948,822 | 2,756,197 | $ 2,856,275 | $ 2,415,491
Ukrainian Conflict |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Reserve for losses and loss adjustment expenses | 66,200 |  | 66,200 |  | 79,300 |
Covid-19 |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Reserve for losses and loss adjustment expenses | $ 13,900 |  | 13,900 |  | $ 39,000 |
Specialty Contracts |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | (20,300) | (23,600) |  |
Casualty Lines |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | 8,800 | 27,700 |  |
Casualty Lines | Reinsurance Contract [Axis]: Loss Portfolio Transfer Agreement |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | (4,000) | (6,000) |  |
Property Contracts |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | 6,600 | (1,600) |  |
Attritional Losses |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | (4,000) | 11,500 |  |
Catastrophe Losses |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net prior year development, unfavorable (favorable) |  |  | $ (4,900) | $ (15,000) |  |

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