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Segment Information - Disaggregation of Revenue Generating Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 540,921 $ 414,223
Core advertising    
Disaggregation of Revenue [Line Items]    
Total operating revenues 361,303 235,821
Political    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,311 18,720
Retransmission and carriage fees    
Disaggregation of Revenue [Line Items]    
Total operating revenues 156,497 138,950
Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 21,810 $ 20,732