Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Intangible assets:
Intangible assets, Gross	$ 1,561,744	$ 1,524,101
Accumulated Amortization	(460,294)	(431,419)
Intangible assets, Net	1,101,450	1,092,682
Acquired network distribution [Member]
Intangible assets:
Intangible assets, Gross	726,611	717,834
Accumulated Amortization	(244,396)	(232,856)
Intangible assets, Net	482,215	484,978
Customer and advertiser lists [Member]
Intangible assets:
Intangible assets, Gross	215,811	209,314
Accumulated Amortization	(98,536)	(93,232)
Intangible assets, Net	117,275	116,082
Copyrights and other trade names [Member]
Intangible assets:
Intangible assets, Gross	378,422	362,236
Accumulated Amortization	(69,750)	(61,286)
Intangible assets, Net	308,672	300,950
Broadcast licenses [Member]
Intangible assets:
Intangible assets, Gross	121,034	114,832
Accumulated Amortization	(9,741)	(7,861)
Intangible assets, Net	111,293	106,971
Acquired rights and other [Member]
Intangible assets:
Intangible assets, Gross	119,866	119,885
Accumulated Amortization	(37,871)	(36,184)
Intangible assets, Net	$ 81,995	$ 83,701