XML 142 R95.htm IDEA: XBRL DOCUMENT v3.21.1
Employee benefit plans - Summary of movement in the fair value of plan assets of the year (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance $ 26,568 $ 48,059
Interest income on plan assets 778 1,881
Actuarial gain (loss) (1,324) 1,517
Contributions by employer 1,281 0
Benefit payments (318) (2,341)
Exchange gain (loss) (429) 1,882
Ending Balance 8,470 26,568
Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 38,548 53,314
Interest income on plan assets 1,186 2,116
Actuarial gain (loss) 2,116 7,878
Assets distributed on settlement (18,086) (24,430)
Benefit payments 1,352 3,765
Exchange gain (loss) 158 (985)
Ending Balance 24,695 38,548
Employee benefit plans | Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 1,958 1,864
Interest income on plan assets 42 72
Actuarial gain (loss) 59 82
Contributions by employer 1,281 0
Benefit payments (138) (152)
Exchange gain (loss) (61) 92
Ending Balance 0 1,958
Employee benefit plans | Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 20,182 16,239
Interest income on plan assets 639 669
Actuarial gain (loss) 2,664 3,097
Assets distributed on settlement (3,141) 0
Benefit payments 1,172 1,576
Exchange gain (loss) (361) 428
Ending Balance 21,974 20,182
SERP | Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 24,610 46,195
Interest income on plan assets 736 1,809
Actuarial gain (loss) (1,383) 1,435
Contributions by employer 0 0
Benefit payments (180) (2,189)
Exchange gain (loss) (368) 1,790
Ending Balance 8,470 24,610
SERP | Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 18,366 37,075
Interest income on plan assets 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