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Debt - Footnote to Borrowings (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2012
loan
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Proceeds from borrowings   $ 5,000 $ 0    
Weighted average annual effect rate 4.05% 4.02%      
Bank Term Loan - A Facility          
Debt Instrument [Line Items]          
Floating eurodollar base rate 2.40% 2.40%      
Long term debt $ 1,308,656 $ 1,308,656     $ 1,355,062
Senior Notes          
Debt Instrument [Line Items]          
Long term debt $ 800,000 $ 800,000     800,000
Debt instrument, fixed interest rate 5.125% 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 4.15% 4.15%      
Additional interest above base rate   1.75%      
Remaining borrowing capacity $ 1,100,000 $ 1,100,000      
Long term debt 92,000 92,000     $ 155,000
Economic Development Loan 1 | Connecticut Economic Development Program          
Debt Instrument [Line Items]          
Long term debt $ 1,800 $ 1,800      
Debt instrument, fixed interest rate 3.00% 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% 1.75%      
Debt term   10 years      
Period payments are deferred   7 years      
Possible forgiveness of debt   $ 5,000      
Period of possible forgiveness   5 years