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Investments and Other Assets - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May 14, 2018
USD ($)
Jul. 31, 2017
Jun. 30, 2018
USD ($)
seat
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
seat
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]              
Equity method investments     $ 31,910   $ 31,910   $ 27,098
Number of seats on the board of directors | seat     2   2    
Equity income (loss) in unconsolidated investments, net     $ 15,547 $ (946) $ 14,309 $ (2,415)  
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)   12.00%     12.00%    
Equity method investments     $ 20,800   $ 20,800    
Equity income (loss) in unconsolidated investments, net         $ 14,800    
Proceeds from dividends received $ 9,900            
Gain on sale of equity method investment $ 16,800