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Operating leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Schedule of Lease Costs Lease costs recorded under operating leases for the three and nine months ended September 30, 2021 and September 30, 2020 were as follows:
Three Months EndedNine Months Ended
September 30, 2021September 30, 2020September 30, 2021September 30, 2020
(in thousands)(in thousands)
Operating lease costs$18,905 $7,417 $34,243 $23,274 
Income from sub-leases(312)(268)(743)(781)
Net operating lease costs$18,593 $7,149 $33,500 $22,493 
Schedule of Operating Lease Maturity Future minimum lease payments under non-cancelable leases as of September 30, 2021 were as follows:
Minimum rental payments
(in thousands)September 30, 2021
Year 1$67,214 
Year 255,183 
Year 336,907 
Year 424,320 
Year 520,284 
Thereafter70,292 
Total future minimum lease payments274,200 
Lease imputed interest(21,345)
Total$252,855