Goodwill and Intangible Assets - Other Amortizable Intangible (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in other amortizable intangible assets
Net balance at the beginning of the period	$ 15,901	$ 22,400
Additions		2,746
Impairment	(1,059)
Amortization	(6,767)	(9,245)
Net balance at the end of the period	8,075	15,901
Affiliate relationships
Changes in other amortizable intangible assets
Net balance at the beginning of the period	14,352	20,273
Additions		1,668
Impairment	(1,059)
Amortization	(5,989)	(7,589)
Net balance at the end of the period	7,304	14,352
Advertiser relationships
Changes in other amortizable intangible assets
Net balance at the beginning of the period	138	690
Amortization	(138)	(552)
Net balance at the end of the period		138
Non-compete agreement
Changes in other amortizable intangible assets
Net balance at the beginning of the period	826	686
Additions		1,078
Amortization	(497)	(938)
Net balance at the end of the period	329	826
Other intangibles
Changes in other amortizable intangible assets
Net balance at the beginning of the period	68	144
Amortization	(53)	(76)
Net balance at the end of the period	15	68
Programming contracts
Changes in other amortizable intangible assets
Net balance at the beginning of the period	517	607
Amortization	(90)	(90)
Net balance at the end of the period	$ 427	$ 517