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Debt - Debt Outstanding Footnotes (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 30, 2017
Debt Instrument [Line Items]        
Long-term debt, gross $ 2,207,514 $ 2,312,092    
Proceeds from borrowings $ 5,000 0 $ 3,025,000  
Weighted average annual effective rate 4.11%      
Long-term Debt, Fiscal Year Maturity        
2020 $ 139,700      
2021 37,600      
2022 1,200,000      
2023 800,000      
Thereafter 5,000      
Write off of deferred financing fees     6,100  
Payments of deferred financing fees 0 0 $ 51,171  
Senior notes        
Debt Instrument [Line Items]        
Long-term debt, gross $ 800,000 800,000    
Debt instrument, fixed interest rate 5.125%      
Connecticut Economic Development Program        
Debt Instrument [Line Items]        
Long-term debt, gross $ 6,545 2,030    
Number of loans | loan 2      
Term B facility        
Long-term Debt, Fiscal Year Maturity        
Write off of deferred financing fees   6,900    
CEB | Senior notes        
Debt Instrument [Line Items]        
Debt instrument, fixed interest rate       5.125%
Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate at period end 3.30%      
Floating eurodollar base rate 1.80%      
Additional interest above base rate 1.50%      
Line of credit facility, remaining borrowing capacity $ 1,000,000      
Long-term debt, gross 148,000 $ 155,000    
Economic Development Loan 1 | Connecticut Economic Development Program        
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,500      
Debt instrument, fixed interest rate 3.00%      
Proceeds from borrowings $ 5,000      
Economic Development Loan 2 | Connecticut Economic Development Program        
Debt Instrument [Line Items]        
Debt instrument, fixed interest rate 1.75%      
Debt instrument term 10 years      
Deferred payment term 7 years      
Possible forgiveness of principal $ 5,000      
Debt forgiveness period 5 years