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Operating leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost | $ 11,896 | $ 18,593 | $ 40,078 | $ 33,500
Early termination options reasonably certain to be exercised | 0 | 0 | 0 | 4,200
Right-of-use assets obtained in exchange for lease obligations | $ 1,700 | $ 1,100 | $ 37,600 | $ 4,900
Weighted average remaining lease term | 6 years 9 months 7 days |  | 6 years 9 months 7 days |
Weighted average discount rate | 2.48% |  | 2.48% |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities | Other Liabilities | Other Liabilities | Other Liabilities
Other liabilities |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease liabilities | $ 42,200 | $ 61,900 | $ 42,200 | $ 61,900
Selling, general and administration costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | 38,100 | 31,900
Direct costs |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Total lease cost |  |  | $ 2,000 | $ 1,600

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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