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Business Acquisitions - Allocation of Aggregate Purchase Consideration (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 28, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,867,430 |  | $ 1,633,033 | $ 1,380,376
Deferred revenue | (22,400) |  | (28,000) |
Fiscal 2020 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable | 46,332 |  |  |
Prepaid expenses and other current assets | 9,105 |  |  |
Property and equipment | 2,248 |  |  |
Operating lease right of use asset | 10,644 |  |  |
Goodwill | 218,745 |  |  |
Other long-term assets | 685 |  |  |
Deferred tax asset | 992 |  |  |
Accounts payables and accrued expenses | (29,073) |  |  |
Deferred revenue | (22,436) |  |  |
Operating lease liabilities, current | (4,520) |  |  |
Long-term debt | (910) |  |  |
Operating lease liabilities, noncurrent | (13,104) |  |  |
Income taxes payable | (3,297) |  |  |
Liability for uncertain tax positions | (1,576) |  |  |
Deferred tax liability | (53,870) |  |  |
Other long-term liabilities | (9,269) |  |  |
Total | 497,750 |  |  |
Fiscal 2020 Acquisitions | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles | 67,670 |  |  |
Fiscal 2020 Acquisitions | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles | 222,582 |  |  |
Fiscal 2020 Acquisitions | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles | $ 56,802 |  |  |
RetailMeNot, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  | $ 40,525 |  |
Prepaid expenses and other current assets |  | 7,367 |  |
Property and equipment |  | 587 |  |
Operating lease right of use asset |  | 10,313 |  |
Goodwill |  | 169,581 |  |
Other long-term assets |  | 494 |  |
Deferred tax asset |  | 605 |  |
Accounts payables and accrued expenses |  | (24,526) |  |
Deferred revenue |  | (11,175) |  |
Operating lease liabilities, current |  | (4,029) |  |
Operating lease liabilities, noncurrent |  | (13,085) |  |
Income taxes payable |  | (3,308) |  |
Liability for uncertain tax positions |  | (1,576) |  |
Deferred tax liability |  | (52,504) |  |
Other long-term liabilities |  | (9,275) |  |
Total |  | 414,384 |  |
RetailMeNot, Inc. | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  | 62,940 |  |
RetailMeNot, Inc. | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  | 198,840 |  |
RetailMeNot, Inc. | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  | $ 42,610 |  |
Fiscal 2019 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  | 22,796 |
Prepaid expenses and other current assets |  |  | 4,528 |
Property and equipment |  |  | 4,625 |
Operating lease right of use asset |  |  | 4,982 |
Goodwill |  |  | 253,096 |
Other long-term assets |  |  | 660 |
Accounts payables and accrued expenses |  |  | (31,292) |
Other current liabilities |  |  | (516) |
Deferred revenue |  |  | (27,953) |
Operating lease liabilities, current |  |  | (1,768) |
Operating lease liabilities, noncurrent |  |  | (3,215) |
Income taxes payable |  |  | (762) |
Liability for uncertain tax positions |  |  | (170) |
Deferred tax liability |  |  | (10,229) |
Other long-term liabilities |  |  | (635) |
Total |  |  | 429,517 |
Fiscal 2019 Acquisitions | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  | 10,773 |
Fiscal 2019 Acquisitions | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  | 123,611 |
Fiscal 2019 Acquisitions | Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  | 32,540 |
Fiscal 2019 Acquisitions | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  | $ 48,446 |
Fiscal 2018 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash |  |  |  | 15,532
Accounts receivable |  |  |  | 11,321
Prepaid expenses and other current assets |  |  |  | 3,480
Property and equipment |  |  |  | 4,755
Goodwill |  |  |  | 194,282
Other long-term assets |  |  |  | 341
Deferred tax asset |  |  |  | 821
Accounts payables and accrued expenses |  |  |  | (10,864)
Deferred revenue |  |  |  | (37,113)
Finance lease |  |  |  | (956)
Income taxes payable |  |  |  | (1,458)
Deferred tax liability |  |  |  | (22,990)
Other long-term liabilities |  |  |  | (5,410)
Total |  |  |  | 340,199
Fiscal 2018 Acquisitions | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  |  | 33,750
Fiscal 2018 Acquisitions | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  |  | 66,516
Fiscal 2018 Acquisitions | Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  |  | 3,285
Fiscal 2018 Acquisitions | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangibles |  |  |  | $ 84,907

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