Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]                      
Goodwill impairment $ 0 $ 0 $ (131,997) $ 0 $ 0 $ 0 $ 0 $ 0 $ (131,997) $ 0 $ 0
Amortization expense of intangible assets                 13,100 $ 20,500 $ 3,400
Sold | Ticketfly                      
Goodwill [Line Items]                      
Asset Impairment Charges     (131,700)           (131,700)    
Fair value of net assets $ 184,500   $ 184,500           184,500    
Sold | KXMZ                      
Goodwill [Line Items]                      
Goodwill impairment                 $ (300)