Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Carrying amount:
Total carrying amount	$ 110,609	$ 104,709
Accumulated amortization:
Total accumulated amortization	(26,585)	(24,662)
Net amortizable intangible assets	84,024	80,047
Total other intangible assets	141,839	137,862
Licensing agreements
Accumulated amortization:
Other indefinite-lived intangible assets — FCC licenses	57,815	57,815
Television network affiliation relationships
Carrying amount:
Total carrying amount	78,844	78,844
Accumulated amortization:
Total accumulated amortization	(10,678)	(9,691)
Customer lists and advertiser relationships
Carrying amount:
Total carrying amount	26,404	22,304
Accumulated amortization:
Total accumulated amortization	(13,967)	(13,138)
Other
Carrying amount:
Total carrying amount	5,361	3,561
Accumulated amortization:
Total accumulated amortization	$ (1,940)	$ (1,833)