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Operating leases - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost | $ 7,329,000 | $ 7,522,000 | $ 14,907,000 | $ 15,343,000 |
Early termination options reasonably certain to be exercised | 0 | 1,600,000 | 4,200,000 | 1,600,000 |
Right-of-use assets obtained in exchange for lease obligations | 1,000,000.0 | 200,000 | 3,800,000 | 4,500,000 |
Impairment of right-of-use assets | $ 0 |  | $ 0 | 5,411,000 | $ 5,400,000
Weighted average remaining lease term | 3 years 11 months 4 days |  | 3 years 11 months 4 days |  |
Weighted average discount rate | 2.52% |  | 2.52% |  |
Operating lease liabilities | $ 22,800,000 | $ 23,100,000 | $ 22,800,000 | 23,100,000 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other liabilities |  | Other liabilities |  | Other liabilities
Selling, general and administration costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost |  |  | $ 13,800,000 | 14,000,000.0 |
Direct costs |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Total lease cost |  |  | $ 1,100,000 | $ 1,300,000 |

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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 http://asc.fasb.org/extlink&oid=123408670&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 http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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