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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Carrying amount:    
Total carrying amount $ 355,013 $ 320,867
Accumulated amortization:    
Total accumulated amortization (86,253) (65,531)
Net amortizable intangible assets 268,760 255,336
Total other intangible assets 425,975 412,551
FCC licenses    
Accumulated amortization:    
Other indefinite-lived intangible assets - FCC licenses 157,215 157,215
Television network affiliation relationships    
Carrying amount:    
Total carrying amount 248,444 248,444
Accumulated amortization:    
Total accumulated amortization (49,639) (37,019)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 69,500 45,500
Accumulated amortization:    
Total accumulated amortization (26,345) (22,525)
Other intangible assets    
Carrying amount:    
Total carrying amount 37,069 26,923
Accumulated amortization:    
Total accumulated amortization $ (10,269) $ (5,987)