Propert and Equipment (Property, Plant, Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 438,784	$ 373,096
Accumulated Depreciation And Amortization	(272,148)	(209,236)
Property and equipment, net	166,636	163,860
Program, service and test equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	223,847	199,190
Satellite Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 51,423	42,367
Property, Plant and Equipment, Useful Life	13 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 21,471	18,846
Transmission Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 51,954	47,218
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 90,089	$ 65,475
Minimum [Member] | Program, service and test equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Minimum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member] | Program, service and test equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	8 years