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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