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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fiscal 2021 Acquisitions |  |  |
Revenues | $ 1,482,323,000 | $ 1,267,280,000 |
Net income from continuing operations | $ 416,348,000 | $ 33,351,000 |
EPS - Basic (in usd per share) | $ 9.06 | $ 0.72 |
EPS - Diluted (in usd per share) | $ 8.69 | $ 0.71 |
SEOmoz Acquisition |  |  |
Revenues | $ 1,438,099,000 | $ 1,207,910,000 |
Net income from continuing operations | $ 406,281,000 | $ 29,382,000 |
EPS - Basic (in usd per share) | $ 8.84 | $ 0.63 |
EPS - Diluted (in usd per share) | $ 8.48 | $ 0.62 |
Fiscal 2020 Acquisitions |  |  |
Revenues |  | $ 1,339,927,000 | $ 1,306,479,000
Net income from continuing operations |  | $ 21,450,000 | $ 11,773,000
EPS - Basic (in usd per share) |  | $ 0.46 | $ 0.24
EPS - Diluted (in usd per share) |  | $ 0.45 | $ 0.23
RetailMeNot, Inc. |  |  |
Revenues |  | $ 1,308,731,000 | $ 1,267,847,000
Net income from continuing operations |  | $ 23,395,000 | $ 22,117,000
EPS - Basic (in usd per share) |  | $ 0.50 | $ 0.46
EPS - Diluted (in usd per share) |  | $ 0.49 | $ 0.44
Fiscal 2019 Acquisitions |  |  |
Revenues |  |  | $ 1,152,542,000
Net income from continuing operations |  |  | $ 35,203,000
EPS - Basic (in usd per share) |  |  | $ 0.73
EPS - Diluted (in usd per share) |  |  | $ 0.71
Highwinds Capital, Inc. and Cloak Holdings, LLC |  |  |
Revenues |  |  | $ 1,072,047,000
Net income from continuing operations |  |  | $ 43,345,000
EPS - Basic (in usd per share) |  |  | $ 0.90
EPS - Diluted (in usd per share) |  |  | $ 0.88
BabyCenter LLC. |  |  |
Revenues |  |  | $ 1,080,644,000
Net income from continuing operations |  |  | $ 35,953,000
EPS - Basic (in usd per share) |  |  | $ 0.75
EPS - Diluted (in usd per share) |  |  | $ 0.73
Spiceworks, Inc. |  |  |
Revenues |  |  | $ 1,089,648,000
Net income from continuing operations |  |  | $ 36,711,000
EPS - Basic (in usd per share) |  |  | $ 0.76
EPS - Diluted (in usd per share) |  |  | $ 0.74

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