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Sale of MATCHNow- Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Aug. 04, 2020	May 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total sale proceeds received			$ 60,592,000	$ 0	$ 400,192,000
Recognized gain on sale			58,652,000	$ 0	$ 335,211,000
MATCHNow
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment			$ 0
MATCHNow | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of interests disposed		100.00%
Total sale proceeds received	$ 60,592,000
Contingent consideration (up to)	23,000,000.0
Transaction costs	2,453,000
Recognized gain on sale	$ 56,199,000

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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