Goodwill and Intangible Assets - Other Amortizable Intangible (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in other amortizable intangible assets
Net balance at the beginning of the period			$ 8,075
Additions			30,767
Amortization	$ 3,200	$ 1,600	4,787	$ 3,500
Net balance at the end of the period	34,055		34,055
Future estimated amortization expense
Remainder of 2021	6,415		6,415
2022	8,210		8,210
2023	6,772		6,772
2024	6,772		6,772
2025 and thereafter	5,886		5,886
Total	34,055		$ 34,055
Weighted Average
Changes in other amortizable intangible assets
Remaining amortization period			3 years 10 months 24 days
Affiliate and customer relationships
Changes in other amortizable intangible assets
Net balance at the beginning of the period			$ 7,304
Amortization			2,886
Net balance at the end of the period	4,418		4,418
Future estimated amortization expense
Total	4,418		4,418
Non-compete agreement
Changes in other amortizable intangible assets
Net balance at the beginning of the period			329
Amortization			180
Net balance at the end of the period	149		149
Future estimated amortization expense
Total	149		149
Programming contracts
Changes in other amortizable intangible assets
Net balance at the beginning of the period			427
Additions			30,767
Amortization			1,710
Net balance at the end of the period	29,484		29,484
Future estimated amortization expense
Total	29,484		29,484
Other intangibles
Changes in other amortizable intangible assets
Net balance at the beginning of the period			15
Amortization			11
Net balance at the end of the period	4		4
Future estimated amortization expense
Total	$ 4		$ 4