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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |
Gross reserves for loss and loss adjustment expenses, beginning of year | $ 937,157 | $ 720,570 | $ 605,129 |  |  |  |
Less: loss and loss adjustment expenses recoverable, beginning of year | (5,520) | (2,031) | (1,113) | $ (5,520) | $ (2,031) | $ (1,113) | $ (1)
Net reserves for loss and loss adjustment expenses, beginning of year |  |  |  | 1,099,434 | 931,279 | 719,457 | 605,128
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |  |  |  |
Current year | 489,994 | 434,276 | 422,801 |  |  |  |
Prior years | 86,495 | (4,138) | 52,743 |  |  |  |
Total incurred loss and loss adjustment expenses | 403,499 | 438,414 | 370,058 |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |  |  |  |
Current year | (63,638) | (85,173) | (110,799) |  |  |  |
Prior years | (188,392) | (132,336) | (162,447) |  |  |  |
Total net paid losses | (252,030) | (217,509) | (273,246) |  |  |  |
Foreign currency translation | 16,686 | (9,083) | 17,517 |  |  |  |
Net reserves for loss and loss adjustment expenses, beginning of year |  |  |  | 1,099,434 | 931,279 | 719,457 | 605,128
Plus: loss and loss adjustment expenses recoverable, end of year | (5,520) | (2,031) | (1,113) |  |  |  |
Deferred Costs |  |  |  | $ (6,738) | $ (3,847) | $ 0 | $ 0
Gross reserves for loss and loss adjustment expenses, end of year | 1,111,692 | 937,157 | 720,570 |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Including Amortization of Deferred Gains | 86,500 | (4,100) | 52,700 |  |  |  |
Impact On Underwriting Income [Member] |  |  |  |  |  |  |
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 | 3,700 | 6,200 | 4,600 |  |  |  |
Ratio Split [Member] |  |  |  |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |  |  |  |
Prior years | 98,500 | 12,900 | 22,300 |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |  |  |  |
Change In Policy Acquisition Costs | (100,900) | (7,700) | (19,800) |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Earned Premium | (7,800) |  |  |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 5,400 | 5,200 | 2,500 |  |  |  |
Premium Adjustments on Certain Contracts [Member] |  |  |  |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |  |  |  |
Prior years | (12,000) | (17,000) | 30,400 |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |  |  |  |
Change in Accounting Estimate, Financial Impact | (4,800) | (22,400) | 52,100 |  |  |  |
Change In Policy Acquisition Costs | 7,200 | (5,400) | 21,700 |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Premium Estimates | 3,100 | 23,400 | (50,000) |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | (1,700) | 1,000 | 2,100 |  |  |  |
Auto contracts [Member] | Ratio Split [Member] |  |  |  |  |  |  |
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 |  | (4,600) |  |  |  |
Retroactive reinsurance contracts | Ratio Split [Member] |  |  |  |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |  |  |  |
Prior years | 69,400 |  |  |  |  |  |
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |  |  |  |
Change In Policy Acquisition Costs | (68,900) |  |  |  |  |  |
Prior Year Claims and Claims Adjustment Expense, Increase (Decrease) in Net Underwriting Loss | 500 |  |  |  |  |  |
Other Contracts [Member] | Ratio Split [Member] |  |  |  |  |  |  |
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) | 1,300 |  |  |  |
Multi-line | Ratio Split [Member] |  |  |  |  |  |  |
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 | (8,100) |  |  |  |  |  |
Workers’ Compensation | Ratio Split [Member] |  |  |  |  |  |  |
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 | 14,900 | $ 15,800 | $ 5,800 |  |  |  |
General Liability [Member] | Ratio Split [Member] |  |  |  |  |  |  |
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 | $ (8,800) |  |  |  |  |  |

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