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Retirement plans - Defined benefit pension plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year $ 19,663  
Current service cost 2,639 $ 1,981
Past service cost 0 1,279
Interest cost on accrued benefit obligations / (income) on assets 800 827
Balance, end of year 22,170 19,663
Unfunded status 22,170 19,663
Minimum funding requirement 0 0
Accrued benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year 60,618 65,393
Current service cost 2,639 1,981
Past service cost 0 1,279
Interest cost on accrued benefit obligations / (income) on assets 2,196 2,247
Benefit payments (7,092) (3,558)
Actuarial (gain) loss 8,041 (652)
Foreign exchange gain (loss) (341) (6,072)
Balance, end of year 66,061 60,618
Fair values of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year 40,955 46,991
Interest cost on accrued benefit obligations / (income) on assets 1,396 1,420
Contributions 4,056 2,452
Benefit payments (7,092) (3,558)
Return (loss) on plan assets 2,500 (2,846)
Foreign exchange gain (loss) 2,076 (3,504)
Balance, end of year $ 43,891 $ 40,955