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Business Acquisitions (Pro Forma Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fiscal 2022 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 342,173 | $ 366,258 | $ 1,010,600 | $ 1,041,436
Net income (loss) from continuing operations | $ 18,120 | $ 4,925 | $ (3,801) | $ 23,369
(Loss) income per common share from continuing operations - Basic (usd per share) | $ 0.39 | $ 0.11 | $ (0.08) | $ 0.52
(Loss) income per common share from continuing operations - Diluted (usd per share) | $ 0.39 | $ 0.10 | $ (0.08) | $ 0.49
Fiscal 2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues |  | $ 374,202 |  | $ 1,045,184
Net income (loss) from continuing operations |  | $ 6,886 |  | $ 25,490
(Loss) income per common share from continuing operations - Basic (usd per share) |  | $ 0.15 |  | $ 0.56
(Loss) income per common share from continuing operations - Diluted (usd per share) |  | $ 0.14 |  | $ 0.54
SEOmoz Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues |  | $ 367,414 |  | $ 1,028,545
Net income (loss) from continuing operations |  | $ 6,610 |  | $ 24,030
(Loss) income per common share from continuing operations - Basic (usd per share) |  | $ 0.14 |  | $ 0.53
(Loss) income per common share from continuing operations - Diluted (usd per share) |  | $ 0.14 |  | $ 0.51

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