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Operating leases (Tables)
 6 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Schedule of Lease Costs Lease costs recorded under operating leases for the three and six months ended June 30, 2021 and June 30, 2020 were as follows:
Three Months EndedSix Months Ended
June 30, 2021June 30, 2020June 30, 2021June 30, 2020
(in thousands)(in thousands)
Operating lease costs$7,549 $7,768 $15,338 $15,857 
Income from sub-leases(220)(246)(431)(514)
Net operating lease costs$7,329 $7,522 $14,907 $15,343 
Schedule of Operating Lease Maturity
Future minimum lease payments (including related costs), associated with the 2020 restructuring plan, under the non-cancelable onerous leases as at June 30, 2021 were as follows:

Minimum rental payments
(in thousands)
June 30, 2021
2021$1,210 
20221,872 
20231,015 
2024142 
2025141 
Thereafter401 
Total future minimum lease payments (including related costs)4,781 
Lease imputed interest(408)
Total$4,373 
Future minimum lease payments under non-cancelable leases as of June 30, 2021 were as follows:
Minimum rental payments
(in thousands)
June 30, 2021
Due within 1 year$24,293 
Due between 1 and 5 years43,579 
Thereafter6,377 
Total future minimum lease payments 74,249 
Lease imputed interest(4,107)
Total$70,142