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Goodwill and Intangibles - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Goodwill, Purchase Accounting Adjustments $ 200      
Goodwill 277,263 $ 278,337 $ 251,024  
Amortization expense related to intangible assets 45,100 44,400 53,200  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 1,300 600    
Accretion of contract rights under development agreements and placement fees $ 4,552 4,680 4,702  
Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life (years) 1 year      
Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life (years) 12 years      
Interactive        
Finite-Lived Intangible Assets [Line Items]        
Goodwill, Purchase Accounting Adjustments $ 0      
Goodwill $ 3,543 $ 4,828 $ 4,828 $ 4,800
Long-term growth rate (as a percent) 3.00%      
Discount rate (as a percent) 19.00%