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Segment Information - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total operating revenues $ 591,110 $ 493,262 $ 358,883 $ 414,223 $ 423,055 $ 330,857 $ 320,428 $ 277,059 $ 1,857,478 $ 1,351,399 $ 1,157,362
Core advertising                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 915,515 861,386 686,229
Political                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 272,066 23,263 139,600
Retransmission and carriage                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 588,888 390,043 304,402
Other                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 $ 81,009 $ 76,707 $ 27,131