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Investments and Other Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 18, 2017
Jul. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]                
Equity income (loss) in unconsolidated investments, net     $ 866   $ (1,198) $ (1,549) $ (2,763)  
Proceeds from sale of available-for-sale securities     14,600     14,600    
Realized losses on sale of available-for-sale securities     400     3,900    
Impairment of equity method investments       $ 5,800   5,800    
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)   12.00%            
Equity income (loss) in unconsolidated investments, net     500          
Subsequent Event | Livestream                
Schedule of Equity Method Investments [Line Items]                
Proceeds from sale of equity method investments $ 21,400              
Other long term assets                
Schedule of Cost-method Investments [Line Items]                
Cost method investments     $ 15,300     $ 15,300   $ 14,800