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Acquisitions (Details 3) - USD ($) $ in Thousands | Dec. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 653,176 |  | $ 572,847 | $ 368,481
Business Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable | 3,547 | $ 6,974 | 754 |
Materials and supplies | 582 | 900 | 478 |
Equipment and property | 7,269 | 65,535 | 3,169 |
Goodwill | 73,430 | 191,853 | 12,309 |
Customer contracts | 72,608 | 112,700 | 23,644 |
Trademarks & tradenames | 7,317 |  |  |
Other intangible assets | 1,333 | 49,300 | 850 |
Current liabilities | (15,518) |  | (8,832) |
Other assets and liabilities, net | 9,639 | 421,896 | 11,994 |
Total consideration paid | 160,207 |  | 44,366 |
Less: Contingent consideration liability | (12,594) | $ (26,627) | (9,077) |
Total cash purchase price | $ 147,613 |  | $ 35,289 |

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