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Goodwill and Intangibles, net - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Goodwill, disposition       $ (5,415)    
Developed technology sold       6,400    
Amortization expense $ 1,100   $ 1,400 3,200 $ 4,100  
Goodwill 127,051     127,051   $ 131,741
FCC licenses and Channel share arrangements            
Finite-Lived Intangible Assets [Line Items]            
License increase       43,500    
Increase in licenses through acquisitions       44,200    
Measurement period adjustment       600    
Impairment of intangible assets       $ 100    
BeneVir            
Finite-Lived Intangible Assets [Line Items]            
Goodwill, disposition   $ (3,600)        
704Games            
Finite-Lived Intangible Assets [Line Items]            
Goodwill, disposition $ (1,800)