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Segment Information - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 2,283,532 $ 1,857,478 $ 1,351,399
Core advertising      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,592,121 915,515 861,386
Political      
Disaggregation of Revenue [Line Items]      
Total operating revenues 22,693 272,066 23,263
Retransmission and carriage      
Disaggregation of Revenue [Line Items]      
Total operating revenues 614,892 588,888 390,043
Other      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 53,826 $ 81,009 $ 76,707