Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Long-term Debt Instruments (Details)

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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
Jun. 30, 2016
May 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2012
Debt          
Capital leases $ 16,441,000   $ 12,892,000    
Total debt 6,110,762,000   5,455,533,000    
Less: total current maturities 5,611,000   4,764,000    
Less: total deferred financing costs for Notes 8,343,000   7,155,000    
Total long-term debt 6,096,808,000   5,443,614,000    
Senior Secured Revolving Credit Facility          
Debt          
Principal Amount 1,750,000,000     $ 1,750,000,000 $ 1,250,000,000
Carrying value $ 0   $ 340,000,000    
Senior Notes | 4.25% Senior Notes Due 2020          
Debt          
Stated interest rate 4.25%   4.25%    
Principal Amount $ 500,000,000        
Carrying value $ 496,671,000   $ 496,282,000    
Senior Notes | 5.875% Senior Notes Due 2020          
Debt          
Stated interest rate 5.875%   5.875%    
Principal Amount $ 650,000,000        
Carrying value $ 645,207,000   $ 644,720,000    
Senior Notes | 5.75% Senior Notes Due 2021          
Debt          
Stated interest rate 5.75%   5.75%    
Principal Amount $ 600,000,000        
Carrying value $ 596,048,000   $ 595,720,000    
Senior Notes | 4.625% Senior Notes Due 2023          
Debt          
Stated interest rate 4.625%   4.625%    
Principal Amount $ 500,000,000        
Carrying value $ 495,854,000   $ 495,602,000    
Senior Notes | 6.00% Senior Note Due July 15, 2024          
Debt          
Stated interest rate 6.00%   6.00%    
Principal Amount $ 1,500,000,000        
Carrying value $ 1,485,866,000   $ 1,485,196,000    
Senior Notes | 5.375% Senior Notes Due 2025          
Debt          
Stated interest rate 5.375%   5.375%    
Principal Amount $ 1,000,000,000        
Carrying value $ 989,887,000   $ 989,446,000    
Senior Notes | 5.375% Senior Notes Due 2026          
Debt          
Stated interest rate 5.375% 5.375%      
Principal Amount $ 1,000,000,000 $ 1,000,000,000      
Carrying value $ 988,838,000   $ 0    
Senior Secured Notes | 5.25% Senior Notes Due 2022          
Debt          
Stated interest rate 5.25%   5.25%    
Principal Amount $ 400,000,000        
Carrying value $ 395,950,000   $ 395,675,000