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Debt (Details) - USD ($)
1 Months Ended 6 Months Ended
Mar. 31, 2016
Jan. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Oct. 31, 2015
Debt Instrument [Line Items]            
Debt     $ 3,100,813,000   $ 2,951,822,000  
Less: unamortized discount and debt issuance costs     24,709,000   23,617,000  
Plus: unamortized interest rate swap proceeds     17,718,000   22,463,000  
Total debt     3,093,822,000   2,950,668,000  
Less: current portion long-term debt and notes payable     470,058,000   461,085,000  
Long-term debt     2,623,764,000   $ 2,489,583,000  
Repayments of long-term debt     $ 370,952,000 $ 354,909,000    
Notes due January 2016            
Debt Instrument [Line Items]            
Interest rate     4.75%   4.75%  
Debt     $ 0   $ 370,914,000  
Notes due September 2017            
Debt Instrument [Line Items]            
Interest rate     5.75%   5.75%  
Debt     $ 385,109,000   $ 385,109,000  
Notes due March 2018            
Debt Instrument [Line Items]            
Interest rate     5.60%   5.60%  
Debt     $ 250,000,000   $ 250,000,000  
Notes due May 2018            
Debt Instrument [Line Items]            
Interest rate     4.75%   4.75%  
Debt     $ 350,000,000   $ 350,000,000  
Notes due March 2019            
Debt Instrument [Line Items]            
Interest rate     6.25%   6.25%  
Debt     $ 300,000,000   $ 300,000,000  
Notes due March 2024            
Debt Instrument [Line Items]            
Interest rate     4.625%   4.625%  
Debt     $ 500,000,000   $ 500,000,000  
Notes due January 2037            
Debt Instrument [Line Items]            
Interest rate     5.25%   5.25%  
Debt     $ 115,041,000   $ 115,041,000  
Notes due March 2043            
Debt Instrument [Line Items]            
Interest rate     6.70%   6.70%  
Debt     $ 425,000,000   $ 425,000,000  
Term loans            
Debt Instrument [Line Items]            
Debt     450,000,000   150,000,000  
Other debt            
Debt Instrument [Line Items]            
Debt     $ 5,788,000   $ 15,758,000  
Debt Due 2015            
Debt Instrument [Line Items]            
Interest rate     4.75%      
Repayments of long-term debt     $ 371,000,000      
State of Connecticut DECD Loan - Development Loan            
Debt Instrument [Line Items]            
Loan amount           $ 15,000,000
Debt forgiveness $ 10,000,000          
State of Connecticut DECD Loan - Jobs-Training Grant            
Debt Instrument [Line Items]            
Loan amount           $ 1,000,000
Term Loan [Member] | Notes due December 2020            
Debt Instrument [Line Items]            
Loan amount   $ 300,000,000        
Commercial Paper            
Debt Instrument [Line Items]            
Interest rate     1.1208%   1.12%  
Debt     $ 319,875,000   $ 90,000,000  
Eurodollar | Term Loan [Member] | Notes due December 2020            
Debt Instrument [Line Items]            
Spread on variable rate   1.25%        
Applicable Eurodollar rate   0.63%