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Investments and other assets - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Investment balance       $ 12,233,000 $ 22,960,000
Gain on other equity investments $ 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%  
Investment balance       $ 9,600,000 $ 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