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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill |
| Six Months Ended |  | Year Ended
| June 30, 2021 |  | December 31, 2020
| (in thousands)
Opening balance | $ | 936,257 |  |  | $ | 883,170 |
Current period acquisitions (Note 6) | — |  |  | 27,191 |
Prior period acquisitions | — |  |  | 123 |
Foreign exchange movement | (2,870) |  |  | 25,773 |
Closing balance | $ | 933,387 |  |  | $ | 936,257 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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