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Debt - Footnote to Borrowings (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2012
loan
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Proceeds from borrowings $ 35,000 $ 0    
Weighted average annual effect rate 3.99%      
Bank Term Loan - A Facility        
Debt Instrument [Line Items]        
Floating eurodollar base rate 2.50%      
Long term debt $ 1,336,500     $ 1,355,062
Senior Notes        
Debt Instrument [Line Items]        
Long term debt $ 800,000     800,000
Debt instrument, fixed interest rate 5.125%      
Connecticut Economic Development Program        
Debt Instrument [Line Items]        
Number of loans | loan     2  
Revolving credit facility        
Debt Instrument [Line Items]        
Contractual annualized interest rate 4.00%      
Additional interest above base rate 1.50%      
Remaining borrowing capacity $ 1,000,000      
Long term debt 185,000     $ 155,000
Economic Development Loan 1 | Connecticut Economic Development Program        
Debt Instrument [Line Items]        
Long term debt $ 1,900      
Debt instrument, fixed interest rate 3.00%      
Debt term     10 years  
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 term     10 years  
Period payments are deferred 7 years      
Possible forgiveness of debt $ 5,000      
Period of possible forgiveness 5 years