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Business Acquisitions (Allocation of Aggregate Purchase Price) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,837,539 | $ 1,867,430
Deferred revenue | (5,700) |
Fiscal 2021 Acquisitions |  |
Business Acquisition [Line Items] |  |
Accounts receivable | 3,953 |
Prepaid expenses and other current assets | 1,569 |
Property and equipment | 1,838 |
Operating lease right-of-use assets, noncurrent | 5,888 |
Goodwill | 53,013 |
Deferred tax asset | 230 |
Accounts payable and accrued expenses | (2,207) |
Deferred revenue | (5,664) |
Operating lease liabilities, noncurrent | (7,191) |
Deferred tax liability | (4,238) |
Other long-term liabilities | (1,726) |
Total | 91,780 |
Fiscal 2021 Acquisitions | Trade names |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | 11,514 |
Fiscal 2021 Acquisitions | Customer relationship |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | 5,000 |
Fiscal 2021 Acquisitions | Other intangibles |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets | $ 29,801 |

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