Goodwill and Intangible Assets - Other Amortizable Intangible (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in other amortizable intangible assets
Net balance at the beginning of the period			$ 8,075
Additions			110,671
Amortization	$ 9,800	$ 1,600	14,553	$ 5,200
Net balance at the end of the period	104,193		104,193
Future estimated amortization expense
Remainder of 2021	6,372		6,372
2022	21,171		21,171
2023	19,733		19,733
2024	19,733		19,733
2025 and thereafter	37,184		37,184
Total	104,193		$ 104,193
Weighted Average
Changes in other amortizable intangible assets
Remaining amortization period			6 years 1 month 6 days
Affiliate and customer relationships
Changes in other amortizable intangible assets
Net balance at the beginning of the period			$ 7,304
Additions			56,644
Amortization			9,728
Net balance at the end of the period	54,220		54,220
Future estimated amortization expense
Total	54,220		54,220
Programming contracts
Changes in other amortizable intangible assets
Net balance at the beginning of the period			427
Additions			29,420
Amortization			3,251
Net balance at the end of the period	26,596		26,596
Future estimated amortization expense
Total	26,596		26,596
Brands
Changes in other amortizable intangible assets
Additions			24,607
Amortization			1,230
Net balance at the end of the period	23,377		23,377
Future estimated amortization expense
Total	$ 23,377		23,377
Non-compete agreement
Changes in other amortizable intangible assets
Net balance at the beginning of the period			329
Amortization			329
Future estimated amortization expense
Total
Other intangibles
Changes in other amortizable intangible assets
Net balance at the beginning of the period			15
Amortization			$ 15
Future estimated amortization expense
Total