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Business combinations - Schedule of Acquisitions (Details) - USD ($) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 22, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 933,387,000 |  |  | $ 936,257,000 | $ 883,170,000
Cash outflows |  | $ 0 | $ 47,367,000 |  |  |
Medpass |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash & cash equivalents | $ 10,170,000 |  |  |  |  |
Property, plant and equipment | 45,000 |  |  |  |  |
Operating right of use assets | 539,000 |  |  |  |  |
Goodwill | 27,191,000 |  |  |  |  |
Accounts receivable | 3,033,000 |  |  |  |  |
Prepayments and other current assets | 158,000 |  |  |  |  |
Accounts payable | (368,000) |  |  |  |  |
Unearned revenue | (989,000) |  |  |  |  |
Other liabilities | (2,202,000) |  |  |  |  |
Current lease liabilities | (219,000) |  |  |  |  |
Non-current lease liabilities | (320,000) |  |  |  |  |
Non-current deferred tax liability | (4,090,000) |  |  |  |  |
Net assets acquired | 47,556,000 |  |  |  |  |
Cash outflows | 46,992,000 |  |  |  |  |
Working capital adjustment paid | (564,000) |  |  |  |  |
Contingent consideration | 0 |  |  | $ 0 |  |
Total consideration | 47,556,000 |  |  |  |  |
Goodwill expected to be tax deductible | 0 |  |  |  |  |
Contingent consideration, maximum amount | 6,700,000 |  |  |  |  |
Customer Relationships | Medpass |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Customer relationships/ Order backlog | 11,725,000 |  |  |  |  |
Order backlog | Medpass |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Customer relationships/ Order backlog | $ 2,883,000 |  |  |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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