Investments TV Food Network (Details) - Television Food Network, G.P. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 275,758	$ 264,997	$ 851,209	$ 804,630
Operating income	150,471	123,579	520,848	405,605
Net income	$ 116,431	$ 124,347	$ 421,961	$ 414,272