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Loss and loss adjustment expense reserves - Schedule of activity in the reserve for losses and loss adjustment expenses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Gross reserves for loss and loss adjustment expenses, beginning of year | $ 1,111,692 | $ 937,157 | $ 720,570 |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | (5,520) | (2,031) | (1,113) |
Deferred Costs | (6,738) | (3,847) | 0 |
Net reserves for loss and loss adjustment expenses, beginning of year | 1,289,699 | 1,099,434 | 931,279 | $ 719,457
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Current year | 431,506 | 489,994 | 434,276 |
Prior years | (33,792) | 86,495 | (4,138) |
Total incurred loss and loss adjustment expenses | 465,298 | 403,499 | 438,414 |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Current year | (73,550) | (63,638) | (85,173) |
Prior years | (209,534) | (188,392) | (132,336) |
Total net paid losses | (283,084) | (252,030) | (217,509) |
Foreign currency translation | 8,051 | 16,686 | (9,083) |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | 14,375 | 5,520 | 2,031 |
Deferred Costs | 5,994 | 6,738 | 3,847 |
Gross reserves for loss and loss adjustment expenses, end of year | 1,310,068 | 1,111,692 | 937,157 |
Prior Year Claims and Claims Adjustment Expense, Including Amortization of Deferred Gains | (33,800) | 86,500 | 4,100 |
Premium Adjustments on Certain Contracts |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years | (18,800) | (12,000) | 17,000 |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Change In Policy Acquisition Costs | (5,000) | (7,200) | 5,400 |
Change in Accounting Estimate, Financial Impact | (23,800) | (4,800) | 22,400 |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Premium Estimates | 27,900 | 3,100 | (23,400) |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 4,100 | 1,700 | 1,000 |
Unfavorable (Favorable) Reserve Development |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years | (15,000) | 98,500 | 12,900 |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Change In Policy Acquisition Costs | (11,800) | (100,900) | (7,700) |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | (34,600) | 5,400 | 5,200 |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Earned Premium | 7,800 | 7,800 |  |
Impact On Underwriting Income |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | (30,500) | 3,700 | 6,200 |
General Liability | Unfavorable (Favorable) Reserve Development |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 19,900 | (8,800) |  |
Multi-Line | Unfavorable (Favorable) Reserve Development |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 18,900 | (8,100) |  |
Worker Compensation Contracts | Unfavorable (Favorable) Reserve Development |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 7,600 | 14,900 | (15,800) |
Retroactive reinsurance contracts | Unfavorable (Favorable) Reserve Development |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years | (21,600) | (69,400) |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Change In Policy Acquisition Costs | (19,200) | (68,900) |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | $ (2,400) | (500) |  |
Auto contracts | Unfavorable (Favorable) Reserve Development |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss |  | $ 3,500 |  |
Other Contracts | Unfavorable (Favorable) Reserve Development |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss |  |  | $ (10,500) |

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