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Acquisitions (Details) - USD ($) $ in Thousands | Aug. 01, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Goodwill |  | $ 526,964 | $ 464,392 | $ 332,447
Amteck |  |  |  |
Consideration transferred: |  |  |  |
Cash paid at closing | $ 107,355 |  |  |
Working capital adjustment | 6,892 |  |  |
Notes issued to former owners | 10,000 |  |  |
Estimated fair value of contingent earn-out payments | 12,900 |  |  |
Total consideration transferred | 137,147 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Cash and cash equivalents | 13,554 |  |  |
Billed and unbilled accounts receivable | 43,248 |  |  |
Other current assets | 3,422 |  |  |
Property and equipment | 3,891 |  |  |
Goodwill | 54,554 |  |  |
Identifiable intangible assets | 57,700 |  |  |
Operating lease right-of-use asset | 8,997 |  |  |
Accounts payable | (14,489) |  |  |
Billings in excess of costs and estimated earnings | (15,199) |  |  |
Current maturities of long-term debt | (1,860) |  |  |
Current operating lease liabilities | (1,115) |  |  |
Accrued expenses and other current liabilities | (6,889) |  |  |
Long-term debt | (785) |  |  |
Long-term operating lease liabilities | (7,882) |  |  |
Total assets acquired and liabilities assumed | $ 137,147 |  |  |

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