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Business Acquisitions (Allocation of Aggregate Purchase Price) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,861,332 | $ 1,867,430
Deferred revenue | (7,200) |
Fiscal 2021 Acquisitions |  |
Business Acquisition [Line Items] |  |
Accounts receivable | 5,167 |
Prepaid expenses and other current assets | 1,639 |
Property and equipment | 1,838 |
Operating lease right-of-use assets, noncurrent | 5,888 |
Goodwill | 85,552 |
Deferred tax asset | 230 |
Accounts payable and accrued expenses | (2,800) |
Deferred revenue | (7,192) |
Operating lease liabilities, current | (7,191) |
Other current liabilities | (14) |
Deferred tax liability | (4,936) |
Other long-term liabilities | (1,726) |
Total | 135,104 |
Fiscal 2021 Acquisitions | Trade names |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | 11,843 |
Fiscal 2021 Acquisitions | Customer relationship |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | 11,521 |
Fiscal 2021 Acquisitions | Other intangibles |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | $ 35,285 |

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