Investments Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
	May 14, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Sep. 13, 2018	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Aggregate fair value of investments as of Effective Date							$ 2,224,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		$ 623,000
Equity Method Investment, Net Intangible Assets Subject to Amortization of Basis Difference, Useful Life		14 years
Equity method investments		$ 1,131,050			$ 1,238,457
Income on equity investments, net		45,685		$ 39,137
Distributions from equity investments		$ 153,082		115,137
Television Food Network, G.P.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		31.00%
Equity method investments		$ 1,121,000			1,228,000
Income on equity investments, net		46,000		39,000
Distributions from equity investments		$ 153,000		115,000
CareerBuilder, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage						6.00%
Income on equity investments, net				$ (300)	10,000
Distributions from equity investments	$ 5,000				$ 6,000
Proceeds from Sale of Equity Method Investments			$ 11,000
Equity Method Investment, Realized Gain (Loss) on Disposal			$ (5,000)
Revaluation of Assets
Schedule of Equity Method Investments [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Investments							1,615,000
Fresh-Start Adjustment, Carrying Value of Equity Investees' Amortizable Intangible Assets							1,108,000
Fresh-Start Adjustment, Carrying Value of Equity Investees' Goodwill and Intangible Assets not Subject to Amortization							$ 507,000