Nature of Business and Significant Accounting Policies - Allowance For Doubtful Accounts and Programming Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable:
Threshold period for considering receivable as past due	90 days
Changes in the allowance for doubtful accounts
Beginning of Year	$ 2,645	$ 2,327
Provisions for bad debt	135	417
Write-offs	2,274	107
Recoveries	1	8
End of Year	507	2,645
Programming rights:
Impairment of programming rights	0	1,000
Amortization of programming rights	13,648	12,509
Accumulated amortization of programming rights	$ 58,700	$ 45,100