Description of Business and Basis of Presentation (Narrative) (Details) $ in Thousands		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020 USD ($) segment network	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments | segment		2
Number of national programming networks | network		5
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Decrease to retained earnings		$ (1,691,100)	$ (1,609,428)
Cumulative effects of adoption of accounting standards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to retained earnings			$ 2,000