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Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Nov. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]        
Commercial paper outstanding   $ 150,000   $ 0
Principal amount   2,972,941   3,226,943
Less: unamortized discount   5,605   6,653
Plus: unamortized interest rate swap proceeds   24,810   31,716
Total debt   2,992,146   3,252,006
Less: current portion long-term debt   371,091   324,879
Long-term debt   2,471,055   2,927,127
Repayments of long-term debt   $ 404,952 $ 599,850  
Notes due March 2015        
Debt Instrument [Line Items]        
Interest rate   5.00%    
Debt instrument, face amount   $ 0   $ 274,879
Repayments of long-term debt   $ 275,000    
Notes due January 2016        
Debt Instrument [Line Items]        
Interest rate   4.75%   4.75%
Debt instrument, face amount   $ 370,914   $ 370,914
Notes due September 2017        
Debt Instrument [Line Items]        
Interest rate   5.75%   5.75%
Debt instrument, face amount   $ 385,109   $ 385,109
Notes due March 2018        
Debt Instrument [Line Items]        
Interest rate   5.60%   5.60%
Debt instrument, face amount   $ 250,000   $ 250,000
Notes due May 2018        
Debt Instrument [Line Items]        
Interest rate   4.75%   4.75%
Debt instrument, face amount   $ 350,000   $ 350,000
Notes due March 2019        
Debt Instrument [Line Items]        
Interest rate   6.25%   6.25%
Debt instrument, face amount   $ 300,000   $ 300,000
Notes due November 2022        
Debt Instrument [Line Items]        
Interest rate       5.25%
Debt instrument, face amount   $ 110,000   $ 110,000
Notes due March 2024        
Debt Instrument [Line Items]        
Interest rate   4.625%   4.625%
Debt instrument, face amount   $ 500,000   $ 500,000
Notes due January 2037        
Debt Instrument [Line Items]        
Interest rate   5.25%   5.25%
Debt instrument, face amount   $ 115,041   $ 115,041
Notes due March 2043        
Debt Instrument [Line Items]        
Interest rate   6.70%   6.70%
Debt instrument, face amount   $ 425,000   $ 425,000
Term loans        
Debt Instrument [Line Items]        
Debt instrument, face amount   0   130,000
Repayments of long-term debt   130,000    
Other debt        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 16,877   $ 16,000
Commercial Paper        
Debt Instrument [Line Items]        
Interest rate   0.537%    
Scenario, Forecast | Notes due November 2022        
Debt Instrument [Line Items]        
Interest rate 5.25%      
Repayments of long-term debt $ 110,000