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Employee benefit plans - Summary of amounts recognised in the balance sheet for all pension plans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Present value of obligations   $ (13,830)
Fair value of plan assets   8,470
Asset (liability) on statement of financial position   (5,360)
Employee benefit plans    
Disclosure of defined benefit plans [line items]    
Present value of obligations $ (8,942) (11,109)
Fair value of plan assets 0 0
Asset (liability) on statement of financial position $ (8,942) (11,109)
SERP    
Disclosure of defined benefit plans [line items]    
Present value of obligations   (2,721)
Fair value of plan assets   8,470
Asset (liability) on statement of financial position   $ 5,749