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Investments and other assets - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
investment
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]        
Investment balance $ 35,084   $ 35,084 $ 27,650
Number of investments sold | investment 1      
Proceeds from sale of investments $ 4,300      
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%  
Pre-tax gain on sale of equity method investment   $ 18,600    
Investment balance $ 15,800   $ 15,800 $ 7,900