Program Rights and Obligations (Amortization of Owned and Licensed Program Rights) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Owned original program rights
Predominantly Monetized Individually	$ 349,078
Predominantly Monetized as a Group	61,108
Total	410,186
Licensed program rights
Predominantly Monetized Individually	94,534
Predominantly Monetized as a Group	419,166
Total	513,700
Predominantly Monetized Individually	443,612
Predominantly Monetized as a Group	480,274
Total	$ 923,886