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Segment Information - Disaggregation of Revenue Generating Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 302,726 $ 200,509 $ 840,312 $ 615,226
Core advertising        
Disaggregation of Revenue [Line Items]        
Total operating revenues 165,587 123,236 511,434 377,068
Political        
Disaggregation of Revenue [Line Items]        
Total operating revenues 40,018 1,689 57,484 5,255
Retransmission and carriage        
Disaggregation of Revenue [Line Items]        
Total operating revenues 79,673 63,733 225,391 196,003
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 17,448 $ 11,851 $ 46,003 $ 36,900