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Employee benefit plans - Summary of amounts recognised in the income statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost $ 2,446 $ 2,353
Interest cost 1,186 2,116
Past service cost 0 97
Loss on settlement (5) 32
Expected return on plan assets (778) (1,881)
Employee benefit plans expense (recovery) 2,849 2,717
Employee benefit plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2,446 2,181
Interest cost 639 669
Past service cost 0 0
Loss on settlement (5) 0
Expected return on plan assets (44) (72)
Employee benefit plans expense (recovery) 3,036 2,778
SERP    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0 172
Interest cost 547 1,447
Past service cost 0 97
Loss on settlement 0 32
Expected return on plan assets (734) (1,809)
Employee benefit plans expense (recovery) $ (187) $ (61)