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Employee benefit plans - Summary of movement in the defined benefit obligation over the year (Details) - Present value of defined benefit obligation - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance $ (38,548) $ (53,314)
Current service cost (2,446) (2,353)
Past service cost 0 (97)
Interest cost (1,186) (2,116)
Actuarial gain (loss) (2,116) (7,878)
Assets distributed on settlement 18,091 24,430
Benefit payments 1,352 3,765
Exchange gain (loss) 158 (985)
Ending Balance (24,695) (38,548)
Employee benefit plans    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance (20,182) (16,239)
Current service cost (2,446) (2,181)
Past service cost 0 0
Interest cost (639) (669)
Actuarial gain (loss) (2,664) (3,097)
Assets distributed on settlement 3,146 0
Benefit payments 1,172 1,576
Exchange gain (loss) (361) 428
Ending Balance (21,974) (20,182)
SERP    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance (18,366) (37,075)
Current service cost 0 (172)
Past service cost 0 (97)
Interest cost (547) (1,447)
Actuarial gain (loss) 548 (4,781)
Assets distributed on settlement 14,945 24,430
Benefit payments 180 2,189
Exchange gain (loss) 519 (1,413)
Ending Balance $ (2,721) $ (18,366)