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Investments and Other Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 14, 2018
Jul. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]              
Equity method investments     $ 32,651   $ 32,651   $ 27,098
Equity income (loss) in unconsolidated investments, net     771 $ 866 $ 15,080 $ (1,549)  
CareerBuilder              
Schedule of Equity Method Investments [Line Items]              
Equity method investment retained after disposal, ownership interest (as a percent)   17.00%     17.00%    
Equity method investment retained after disposal, fully diluted ownership interest (as a percent)   10.00%     10.00%    
Equity method investments     $ 21,600   $ 21,600    
Proceeds from dividends received $ 9,900            
Gain on sale of equity method investment $ 16,800            
Equity income (loss) in unconsolidated investments, net         $ 15,700