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Investments and Other Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2017
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Equity loss in unconsolidated investments, net     $ 1,238 $ 1,469  
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 loss in unconsolidated investments, net     $ 1,300    
Forecast          
Schedule of Equity Method Investments [Line Items]          
Proceeds from dividends received   $ 8,000      
Other long term assets          
Schedule of Cost-method Investments [Line Items]          
Cost method investments     $ 22,100   $ 19,400