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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)