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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Goodwill, Impairment Loss $ 27,244    
Goodwill, Subsequent Recognition of Deferred Tax Asset $ 2,546    
Hypothetical Decrease, Fair Value of Reporting Unit 14.00%    
Amortization of Intangible Assets $ 38,570 $ 41,994 $ 30,828
Impairment of Intangible Assets, Finite-lived $ 17,652    
Percentage Of Hypothetical Decrease 20.00%    
National Networks [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss $ 0    
Goodwill, Subsequent Recognition of Deferred Tax Asset 2,546    
International And Other [Member]      
Goodwill [Line Items]      
Goodwill, Impairment Loss 27,244    
Goodwill, Subsequent Recognition of Deferred Tax Asset $ 0