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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying amount:    
Total carrying amount $ 335,121 $ 331,467
Accumulated amortization:    
Total accumulated amortization (82,538) (67,386)
Net amortizable intangible assets 252,583 264,081
Total other intangible assets 456,398 467,896
Indefinite-lived intangible assets - FCC licenses    
Accumulated amortization:    
Indefinite-lived intangible assets — FCC licenses 203,815 203,815
Television network affiliation relationships    
Carrying amount:    
Total carrying amount 248,444 248,444
Accumulated amortization:    
Total accumulated amortization (46,544) (37,019)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 56,100 56,100
Accumulated amortization:    
Total accumulated amortization (28,040) (24,380)
Other    
Carrying amount:    
Total carrying amount 30,577 26,923
Accumulated amortization:    
Total accumulated amortization $ (7,954) $ (5,987)