Segment Information - Disaggregation of Revenue Generating Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 358,883	$ 320,428	$ 773,106	$ 597,487
Core advertising
Disaggregation of Revenue [Line Items]
Total operating revenues	182,089	206,535	417,910	376,452
Political
Disaggregation of Revenue [Line Items]
Total operating revenues	13,368	2,116	32,088	2,996
Retransmission and carriage
Disaggregation of Revenue [Line Items]
Total operating revenues	144,283	93,325	283,233	180,608
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 19,143	$ 18,452	$ 39,875	$ 37,431