Intangible Assets and Goodwill (Assumptions) (Details)	Dec. 31, 2019	Dec. 31, 2018
Measurement Input, Discount Rate
Finite-Lived Intangible Assets [Line Items]
Alternative investment, measurement input	0.080	0.090
Measurement Input, Long-term Revenue Growth Rate
Finite-Lived Intangible Assets [Line Items]
Alternative investment, measurement input	(0.0075)	(0.0075)
Measurement Input, Profit Margin | FCC licenses | Minimum
Finite-Lived Intangible Assets [Line Items]
Alternative investment, measurement input	0.20	0.26
Measurement Input, Profit Margin | FCC licenses | Maximum
Finite-Lived Intangible Assets [Line Items]
Alternative investment, measurement input	0.30	0.28