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Investments and Other Assets - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 17,676,000   $ 17,676,000   $ 22,960,000
Gain on cost method investment 1,600,000   $ 0 $ 0  
CareerBuilder          
Schedule of Equity Method Investments [Line Items]          
Equity method investment retained after disposal, ownership interest (as a percent)     17.00%    
Equity method investment retained after disposal, fully diluted ownership interest (as a percent)     10.00%    
Equity method investments $ 12,700,000   $ 12,700,000   $ 12,400,000
Captivate          
Schedule of Equity Method Investments [Line Items]          
Proceeds from sale of equity method investment   $ 16,200,000      
Pre-tax gain on sale of equity method investment   12,200,000      
After-tax gain on sale of equity method investment   $ 9,200,000