Basis Of Presentation And Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total operating revenues	$ 484,036	$ 489,358	$ 939,024	$ 932,993
Television and Entertainment
Total operating revenues	482,557	486,417	935,984	927,119
Advertising revenue | Television and Entertainment
Total operating revenues	298,899	311,431	568,788	581,870
Retransmission revenues | Television and Entertainment
Total operating revenues	132,342	117,185	265,202	235,327
Carriage fees | Television and Entertainment
Total operating revenues	40,771	40,815	81,910	82,477
Other | Television and Entertainment
Total operating revenues	$ 10,545	$ 16,986	$ 20,084	$ 27,445