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Commitments and Contingencies (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 26, 2017
ft²
Nov. 16, 2016
USD ($)
Dec. 23, 2015
USD ($)
Jan. 15, 2015
USD ($)
Jan. 09, 2013
ft²
Loss Contingencies [Line Items]                
Rent expense $ 1,000,000 $ 1,200,000 $ 1,400,000          
License Agreement litigation | Settled Litigation                
Loss Contingencies [Line Items]                
Final order and judgment             $ 195,000,000  
Final order and judgment post-judgment interest           $ 30,663.89    
Final order and judgment including interest         $ 217,000,000      
MacAndrews & Forbes                
Loss Contingencies [Line Items]                
Area of real estate property (in sq ft) | ft²               6,676
New HQ Lease | MacAndrews & Forbes                
Loss Contingencies [Line Items]                
Area of real estate property (in sq ft) | ft²       3,200