Property and Equipment (Property, Plant, Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 517,127	$ 631,054
Accumulated depreciation and amortization	(261,082)	(347,302)
Property and equipment, net	256,045	283,752
Program, Service and Test Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	251,925	296,680
Satellite Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	41,228	46,871
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	21,024	29,811
Transmission Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 30,539	76,604
Estimated Useful  Lives	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 172,411	$ 181,088
Pending Litigation [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful  Lives	3 years
Maximum [Member] | Program, Service and Test Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful  Lives	5 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful  Lives	8 years