Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Carrying amount:
Total carrying amount	$ 331,167	$ 318,967
Accumulated amortization:
Total accumulated amortization	(55,209)	(43,595)
Net amortizable intangible assets	275,958	275,372
Total other intangible assets	479,773	479,187
Licensing agreements
Accumulated amortization:
Other indefinite-lived intangible assets — FCC licenses	203,815	203,815
Television network affiliation relationships
Carrying amount:
Total carrying amount	248,444	248,444
Accumulated amortization:
Total accumulated amortization	(30,804)	(24,590)
Customer lists and advertiser relationships
Carrying amount:
Total carrying amount	56,100	56,100
Accumulated amortization:
Total accumulated amortization	(21,015)	(17,092)
Other
Carrying amount:
Total carrying amount	26,623	14,423
Accumulated amortization:
Total accumulated amortization	$ (3,390)	$ (1,913)