Investments Ownership Percentages (Details)	Dec. 31, 2017	Jul. 31, 2017	Jun. 30, 2017
CareerBuilder, LLC and Classified Ventures, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment, percent	6.00%	7.00%	32.00%
Dose Media, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment, percent	25.00%
Television Food Network, G.P.
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment, percent	31.00%
TKG Internet Holdings II LLC
Schedule of Equity Method Investments [Line Items]
Ownership in equity method investment, percent	43.00%