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Goodwill and Other Intangible Assets - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Acquisition consideration: |  |  |
Cash, net of cash acquired | $ 604,907 | $ 11,251 |
Identifiable assets acquired and liabilities assumed: |  |  |
Goodwill | 1,338,597 |  | $ 1,243,034
2021 Acquisitions |  |  |
Acquisition consideration: |  |  |
Cash, net of cash acquired | 604,800 |  |
Estimated fair value of contingent consideration | 40,100 |  |
Total consideration transferred | 644,900 |  |
Identifiable assets acquired and liabilities assumed: |  |  |
Current assets, primarily accounts receivable | 219,200 |  |
Long-term assets, primarily property and equipment and operating lease assets | 187,500 |  |
Amortizing intangible assets | 367,200 |  |
Current liabilities, including current portion of operating lease liabilities | (145,400) |  |
Long-term liabilities, primarily operating lease liabilities and deferred income taxes | (79,000) |  |
Total identifiable net assets | 549,500 |  |
Goodwill | 95,400 |  |
Total net assets acquired, including goodwill | $ 644,900 |  |

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