Goodwill and Intangible Assets - Other Amortizable Intangible (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Changes in other amortizable intangible assets
Net balance at the beginning of the period	$ 8,075
Additions	30,817
Amortization	1,561	$ 1,900
Net balance at the end of the period	37,331
Future estimated amortization expense
Remainder of 2021			$ 9,649
2022			8,221
2023			6,783
2024			6,783
2025 and thereafter			5,895
Total	$ 37,331		37,331
Weighted Average
Changes in other amortizable intangible assets
Remaining amortization period	4 years
Affiliate relationships
Changes in other amortizable intangible assets
Net balance at the beginning of the period	$ 7,304
Amortization	1,444
Net balance at the end of the period	5,860
Future estimated amortization expense
Total	5,860		5,860
Non-compete agreement
Changes in other amortizable intangible assets
Net balance at the beginning of the period	329
Amortization	90
Net balance at the end of the period	239
Future estimated amortization expense
Total	239		239
Other intangibles
Changes in other amortizable intangible assets
Net balance at the beginning of the period	15
Amortization	5
Net balance at the end of the period	10
Future estimated amortization expense
Total	10		10
Programming contracts
Changes in other amortizable intangible assets
Net balance at the beginning of the period	427
Additions	30,817
Amortization	22
Net balance at the end of the period	31,222
Future estimated amortization expense
Total	$ 31,222		$ 31,222