Basis Of Presentation And Significant Accounting Policies - Dreamcatcher (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Broadcast rights		$ 105,254	$ 133,683
Other intangible assets, net		1,571,957	1,613,665
Other assets		151,996	139,015
Total Assets (1)	[1]	8,047,704	8,169,328
Contracts payable for broadcast rights		215,857	253,244
Other liabilities		161,582	163,899
Total Liabilities (1)	[1]	4,702,569	4,952,148
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets (1)		77,000	81,000
Total Liabilities (1)		27,000	29,000
Dreamcatcher | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Broadcast rights		1,264	2,622
Other intangible assets, net		69,282	71,914
Other assets		6,827	6,852
Total Assets (1)		77,373	81,388
Contracts payable for broadcast rights		1,429	2,691
Long-term deferred revenue		24,813	25,030
Other liabilities		928	1,017
Total Liabilities (1)		$ 27,170	$ 28,738

[1] (1) The Company’s consolidated total assets as of March 31, 2018 and December 31, 2017 include total assets of variable interest entities (“VIEs”) of $77 million and $81 million, respectively, which can only be used to settle the obligations of the VIEs. The Company’s consolidated total liabilities as of March 31, 2018 and December 31, 2017 include total liabilities of the VIEs of $27 million and $29 million, respectively, for which the creditors of the VIEs have no recourse to the Company (see Note 1).