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Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Jan. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Debt $ 3,301,534   $ 3,380,827
Less: unamortized debt discount and issuance costs 27,600   28,796
Plus: unamortized interest rate swap proceeds 10,378   12,859
Total debt 3,284,312   3,364,890
Less: current portion long-term debt 785,287   614,485
Long-term debt $ 2,499,025   2,750,405
Notes due September 2017      
Debt Instrument [Line Items]      
Interest rate 5.75%    
Debt $ 385,109   385,109
Notes due March 2018      
Debt Instrument [Line Items]      
Interest rate 5.60%    
Debt $ 250,000   250,000
Notes due May 2018      
Debt Instrument [Line Items]      
Interest rate 4.75%    
Debt $ 350,000   350,000
Notes due March 2019      
Debt Instrument [Line Items]      
Interest rate 6.25%    
Debt $ 300,000   300,000
Notes due October 2021      
Debt Instrument [Line Items]      
Interest rate 3.375%    
Debt $ 600,000   600,000
Notes due March 2024      
Debt Instrument [Line Items]      
Interest rate 4.625%    
Debt $ 500,000   500,000
Notes due January 2037      
Debt Instrument [Line Items]      
Interest rate 5.25% 5.25%  
Debt $ 35,841   115,041
Redemption amount   $ 79,000  
Notes due March 2043      
Debt Instrument [Line Items]      
Interest rate 6.70%    
Debt $ 425,000   425,000
Term loans      
Debt Instrument [Line Items]      
Debt 450,000   450,000
Other debt      
Debt Instrument [Line Items]      
Debt $ 5,584   $ 5,677