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Acquisitions (Details) - USD ($) $ in Thousands | Apr. 01, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Goodwill |  | $ 472,778 | $ 464,392 | $ 332,447
TAS Energy |  |  |  |
Consideration transferred: |  |  |  |
Cash paid at closing | $ 105,950 |  |  |
Working capital adjustment | 40,455 |  |  |
Notes issued to former owners | 14,000 |  |  |
Estimated fair value of contingent earn-out payments | 9,100 |  |  |
Total consideration transferred | 169,505 |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |
Cash and cash equivalents | 47,460 |  |  |
Billed and unbilled accounts receivable | 18,702 |  |  |
Other current assets | 15,634 |  |  |
Other long-term assets | 1,556 |  |  |
Property and equipment | 7,709 |  |  |
Goodwill | 72,788 |  |  |
Identifiable intangible assets | 53,400 |  |  |
Lease right-of-use asset | 19,736 |  |  |
Accounts payable | (16,453) |  |  |
Billings in excess of costs and estimated earnings | (24,196) |  |  |
Current lease liabilities | (2,337) |  |  |
Accrued expenses and other current liabilities | (4,109) |  |  |
Long-term lease liabilities | (17,398) |  |  |
Other long-term liabilities | (2,987) |  |  |
Total assets acquired and liabilities assumed | $ 169,505 |  |  |

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