Description of Business and Basis of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment network	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments | segment			2
Number of national programming networks | network			5
Foreign currency translation adjustment	$ 553	$ (45,759)	$ (5,210)	$ (26,955)
Other comprehensive income	(698)	(45,759)	(6,950)	(26,955)
Comprehensive income	133,287	64,573	277,192	243,913
Program rights write-offs	10,300	3,900	13,600	9,200
Operating lease asset	175,677		175,677			$ 0
Lease liabilities	230,871		230,871
ASU No. 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease asset					$ 180,000
Historical deferred rent liability					57,000
Lease liabilities					$ 237,000
Other related costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Program rights write-offs	$ 13,000		$ 13,000
Restatement Adjustment | Materiality Assessment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Foreign currency translation adjustment		(53,200)		(53,200)
Other comprehensive income		(53,200)		(53,200)
Comprehensive income		$ (53,200)		$ (53,200)