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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, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance $ (53,314) $ (59,984)
Current service cost (2,353) (3,204)
Past service cost (97) (146)
Interest cost (2,116) (2,004)
Actuarial gain (loss) (7,878) 1,303
Assets distributed on settlement 24,430 0
Benefit payments 3,765 3,895
Exchange gain (loss) (985) 6,826
Ending Balance (38,548) (53,314)
Employee Benefit Plan    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance (16,239) (16,028)
Current service cost (2,181) (2,935)
Past service cost 0 0
Interest cost (669) (601)
Actuarial gain (loss) (3,097) (1,209)
Assets distributed on settlement 0 0
Benefit payments 1,576 1,066
Exchange gain (loss) 428 3,468
Ending Balance (20,182) (16,239)
SERP    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance (37,075) (43,956)
Current service cost (172) (269)
Past service cost (97) (146)
Interest cost (1,447) (1,403)
Actuarial gain (loss) (4,781) 2,512
Assets distributed on settlement 24,430 0
Benefit payments 2,189 2,829
Exchange gain (loss) (1,413) 3,358
Ending Balance $ (18,366) $ (37,075)