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Restructuring | 6 Months Ended
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Jun. 30, 2021
Restructuring and Related Activities [Abstract] |
Restructuring | Restructuring Restructuring charges No restructuring charge was recognized during the six months ended June 30, 2021 (June 30, 2020: $18.1 million). Prior Period Restructuring charges A restructuring charge of $18.1 million was recognized in the year ended December 31, 2020 under a restructuring plan adopted following a review of operations. The restructuring plan reflected resource rationalization across the business to improve resource utilization, resulting in a charge of $11.4 million and office consolidation resulting in a charge for onerous lease obligations of $6.7 million, including the recognition of an impairment of right of use assets of $5.4 million and provision for other related costs of $1.3 million. No additional charge was recorded during the three and six months ended June 30, 2021.
| Workforce reductions |  | Onerous Lease |  | Total
| (in thousands)
Initial restructuring charge recorded | $ | 11,391 |  |  | $ | 6,698 |  |  | $ | 18,089 |
Utilization | (6,987) |  |  | (1,309) |  |  | (8,296) |
Foreign exchange movement | — |  |  | 325 |  |  | 325 |
Provision at December 31, 2020 | 4,404 |  |  | 5,714 |  |  | 10,118 |
Utilization | (2,299) |  |  | (1,345) |  |  | (3,644) |
Foreign exchange movement | — |  |  | 4 |  |  | 4 |
Provision at June 30, 2021 | $ | 2,105 |  |  | $ | 4,373 |  |  | $ | 6,478 |
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 |  |
2022 | 1,872 |  |
2023 | 1,015 |  |
2024 | 142 |  |
2025 | 141 |  |
Thereafter | 401 |  |
Total future minimum lease payments (including related costs) | 4,781 |  |
Lease imputed interest | (408) |  |
Total | $ | 4,373 |  |
A restructuring charge of $12.5 million was recognized during the year ended December 31, 2018 under a restructuring plan adopted following a review of operations. The restructuring plan reflected resource rationalization across the business to improve resource utilization, resulting in a charge of $9.7 million and office consolidation resulting in the recognition of an onerous lease obligation of $2.8 million. No additional charge was recorded during the six months ended June 30, 2021.
| Workforce reductions |  | Onerous Lease |  | Total
| (in thousands)
Initial restructuring charge recorded | $ | 9,684 |  |  | $ | 2,806 |  |  | $ | 12,490 |
Utilization | (5,399) |  |  | (672) |  |  | (6,071) |
Provision at December 31, 2018 | $ | 4,285 |  |  | $ | 2,134 |  |  | $ | 6,419 |
Utilization | (3,554) |  |  | (1,228) |  |  | (4,782) |
Provision at December 31, 2019 | $ | 731 |  |  | $ | 906 |  |  | $ | 1,637 |
Utilization | (731) |  |  | (276) |  |  | (1,007) |
Provision at December 31, 2020 | $ | — |  |  | $ | 630 |  |  | $ | 630 |
Utilization | — |  |  | (97) |  |  | (97) |
Provision at June 30, 2021 | $ | — |  |  | $ | 533 |  |  | $ | 533 |
At June 30, 2021, $4.4 million is included within other liabilities and $2.6 million within non-current other liabilities.

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(e)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -URI http://asc.fasb.org/topic&trid=2175745 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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