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Asset Write-Downs and Other Charges and Credits - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]        
Acquisition and related integration costs   $ 18,678 $ 26,304 $ 4,124
Restructuring costs   0 3,370 8,911
Impairment of programming assets $ 8,900 $ 0 0 $ 8,920
Professional Service Costs        
Restructuring Cost and Reserve [Line Items]        
Acquisition and related integration costs     $ 4,100