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Debt (Details) - USD ($)
1 Months Ended
May 31, 2017
Jun. 30, 2017
Jan. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Principal amount   $ 3,551,502,000   $ 3,380,827,000
Less: unamortized debt discount and issuance costs   30,630,000   28,796,000
Plus: unamortized interest rate swap proceeds   7,895,000   12,859,000
Total debt   3,528,767,000   3,364,890,000
Less: current portion long-term debt   985,291,000   614,485,000
Long-term debt   $ 2,543,476,000   2,750,405,000
Notes due September 2017        
Debt Instrument [Line Items]        
Interest rate   5.75%    
Principal amount   $ 385,109,000   385,109,000
Notes due March 2018        
Debt Instrument [Line Items]        
Interest rate   5.60%    
Principal amount   $ 250,000,000   250,000,000
Notes due May 2018        
Debt Instrument [Line Items]        
Interest rate   4.75%    
Principal amount   $ 350,000,000   350,000,000
Notes due March 2019        
Debt Instrument [Line Items]        
Interest rate   6.25%    
Principal amount   $ 300,000,000   300,000,000
Notes due October 2021        
Debt Instrument [Line Items]        
Interest rate   3.375%    
Principal amount   $ 600,000,000   600,000,000
Notes due May 2022        
Debt Instrument [Line Items]        
Interest rate 3.875% 3.875%    
Principal amount   $ 400,000,000   0
Loan amount $ 400,000,000      
Notes due March 2024        
Debt Instrument [Line Items]        
Interest rate   4.625%    
Principal amount   $ 500,000,000   500,000,000
Notes due January 2037        
Debt Instrument [Line Items]        
Interest rate   5.25% 5.25%  
Principal amount   $ 35,841,000   115,041,000
Redemption amount     $ 79,000,000  
Notes due March 2043        
Debt Instrument [Line Items]        
Interest rate   6.70%    
Principal amount   $ 425,000,000   425,000,000
Term loans        
Debt Instrument [Line Items]        
Principal amount   300,000,000   450,000,000
Repayments of debt $ 150,000,000      
Other debt        
Debt Instrument [Line Items]        
Principal amount   $ 5,552,000   $ 5,677,000