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Debt - Debt Outstanding Footnotes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 05, 2017
Mar. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2012
Debt Instrument [Line Items]            
Debt instrument, interest rate at period end     4.17%      
Long-term Debt, Fiscal Year Maturity [Abstract]            
2019     $ 102,600      
2020     139,700      
2021     37,600      
2022     1,230,000      
Thereafter     800,000      
Write off of deferred financing fees       $ 6,100    
Payments of deferred financing fees     0 $ 51,171 $ 4,975  
Senior notes            
Debt Instrument [Line Items]            
Proceeds from issuance of debt   $ 800,000        
Connecticut Economic Development Program            
Debt Instrument [Line Items]            
Debt instrument, fixed interest rate           3.00%
Debt instrument term           10 years
Term B facility            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Write off of deferred financing fees     $ 6,900      
CEB            
Debt Instrument [Line Items]            
Proceeds from issuance of debt $ 2,800,000          
CEB | Senior notes            
Debt Instrument [Line Items]            
Proceeds from issuance of debt   $ 800,000        
Debt instrument, fixed interest rate   5.125%        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Interest rate at period end     4.02%      
Floating eurodollar base rate     2.52%      
Additional interest above base rate     1.50%      
Line of credit facility, remaining borrowing capacity     $ 1,000,000      
Revolving Credit Facility | CEB            
Debt Instrument [Line Items]            
Proceeds from issuance of debt $ 275,000