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Business Acquisitions (Pro Forma Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fiscal 2022 Acquisitions
Business Acquisition [Line Items]
Revenues	$ 343,275	$ 353,283	$ 668,309	$ 676,929
Net (loss) income from continuing operations	$ (46,300)	$ (22,941)	$ (21,543)	$ 15,778
(Loss) income per common share from continuing operations - Basic (usd per share)	$ (0.99)	$ (0.51)	$ (0.46)	$ 0.35
(Loss) income per common share from continuing operations - Diluted (usd per share)	$ (0.99)	$ (0.51)	$ (0.46)	$ 0.33
Fiscal 2021 Acquisitions
Business Acquisition [Line Items]
Revenues		$ 351,172		$ 680,194
Net (loss) income from continuing operations		$ (22,156)		$ 19,456
(Loss) income per common share from continuing operations - Basic (usd per share)		$ (0.50)		$ 0.44
(Loss) income per common share from continuing operations - Diluted (usd per share)		$ (0.50)		$ 0.41
SEOmoz Acquisition
Business Acquisition [Line Items]
Revenues		$ 349,473		$ 673,401
Net (loss) income from continuing operations		$ (22,247)		$ 18,767
(Loss) income per common share from continuing operations - Basic (usd per share)		$ (0.50)		$ 0.42
(Loss) income per common share from continuing operations - Diluted (usd per share)		$ (0.50)		$ 0.40

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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