Goodwill And Other Intangible Assets - Changes in carrying amounts of intangible assets (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]
Balance as of December 31, 2016		$ 1,025,134
Amortization		(125,662)
Balance sheet reclassifications		86
Foreign currency translation adjustment		809
Balance as of September 30, 2017		900,367
Indefinite-lived Intangible Assets [Roll Forward]
Balance at December 31, 2016		794,000
Reclassification to assets held for sale (1)	[1]	(38,900)
Balance as of September 30, 2017		755,100
Goodwill [Roll Forward]
Gross balance as of December 31, 2016			$ 3,608,930
Accumulated impairment losses at December 31, 2016			(381,000)
Balance at December 31, 2016		3,227,930
Foreign currency translation adjustment		939
Balance as of September 30, 2017		3,228,869
Total goodwill and other intangible assets		$ 4,884,336	$ 5,047,064

[1] (1) See Note 4 for additional information regarding FCC licenses reclassified to assets held for sale.