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Business Acquisitions (Allocation of Aggregate Purchase Price) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 04, 2021
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,579,957 | $ 1,531,455 |  |
Fiscal 2022 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable | 7,433 |  |  |
Prepaid expenses and other current assets | 4,915 |  |  |
Property and equipment | 369 |  |  |
Operating lease right-of-use assets, noncurrent | 546 |  |  |
Goodwill | 93,827 |  |  |
Other long-term assets | 11 |  |  |
Accounts payables and accrued expenses | (4,656) |  |  |
Deferred revenue | (21,332) |  |  |
Deferred tax liability | (10,436) |  |  |
Other long-term liabilities | (516) |  |  |
Total | 121,704 |  |  |
Fiscal 2022 Acquisitions | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets | 12,838 |  |  |
Fiscal 2022 Acquisitions | Customer relationship |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets | 20,540 |  |  |
Fiscal 2022 Acquisitions | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets | $ 18,165 |  |  |
Fiscal 2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  | $ 4,577 |
Prepaid expenses and other current assets |  |  | 2,585 |
Property and equipment |  |  | 1,838 |
Operating lease right-of-use assets, noncurrent |  |  | 5,888 |
Goodwill |  |  | 84,019 |
Other long-term assets |  |  | 62 |
Deferred tax asset |  |  | 231 |
Accounts payables and accrued expenses |  |  | (2,891) |
Deferred revenue |  | $ (9,500) | (7,806) |
Operating lease liabilities, current |  |  | (7,191) |
Other current liabilities |  |  | (14) |
Deferred tax liability |  |  | (4,122) |
Other long-term liabilities |  |  | (1,726) |
Total |  |  | 134,342 |
Fiscal 2021 Acquisitions | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  | 11,118 |
Fiscal 2021 Acquisitions | Customer relationship |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  | 13,396 |
Fiscal 2021 Acquisitions | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  | $ 34,378 |
SEOmoz Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  |  | $ 3,278
Prepaid expenses and other current assets |  |  |  | 2,512
Property and equipment |  |  |  | 1,838
Operating lease right-of-use assets, noncurrent |  |  |  | 5,888
Goodwill |  |  |  | 41,192
Other long-term assets |  |  |  | 62
Accounts payables and accrued expenses |  |  |  | (2,421)
Deferred revenue |  |  |  | (7,048)
Operating lease liabilities, current |  |  |  | (7,191)
Other current liabilities |  |  |  | (14)
Deferred tax liability |  |  |  | (4,122)
Other long-term liabilities |  |  |  | (785)
Total |  |  |  | 66,996
SEOmoz Acquisition | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 7,200
SEOmoz Acquisition | Customer relationship |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 5,000
SEOmoz Acquisition | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | $ 21,607

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